Game of Life web example not working

Nobody has claimed this yet.

Hello! Great work on Druid! It's really fun to use and very portable.

Trying to run the `game of life` example in a web browser yields the following error in the javascript console:

```
Panicked at 'time not implemented on this platform', library/std/src/sys/wasm/../unsupported/time.rs:13:9

Stack:

Error
at http://localhost:8000/pkg/druid_web_examples.js:546:19
at logError (http://localhost:8000/pkg/druid_web_examples.js:230:18)
at imports.wbg.__wbg_new_59cb74e423758ede (http://localhost:8000/pkg/druid_web_examples.js:545:66)
at console_error_panic_hook::Error::new::h2b214e3b0207e48b (http://localhost:8000/pkg/druid_web_examples_bg.wasm:wasm-function[55939]:0x190b47a)
at console_error_panic_hook::hook_impl::hc41ff54987f5ee4c (http://localhost:8000/pkg/druid_web_examples_bg.wasm:wasm-function[10299]:0x127e13b)
at console_error_panic_hook::hook::h126545eb1cc05067 (http://localhost:8000/pkg/druid_web_examples_bg.wasm:wasm-function[60596]:0x194af37)
at core::ops::function::Fn::call::h84dc32ea5da66069 (http://localhost:8000/pkg/druid_web_examples_bg.wasm:wasm-function[52918]:0x18dbc53)
at std::panicking::rust_panic_with_hook::he9bfe03219d715ba (http://localhost:8000/pkg/druid_web_examples_bg.wasm:wasm-function[18770]:0x14f5d8f)
at std::panicking::begin_panic::{{closure}}::h29d8e4472f2e2dbe (http://localhost:8000/pkg/druid_web_examples_bg.wasm:wasm-function[64624]:0x1979a0f)
at std::sys_common::backtrace::__rust_end_short_backtrace::h07554449d90848f3 (http://localhost:8000/pkg/druid_web_examples_bg.wasm:wasm-function[62796]:0x1966277)

(anonymous) @ druid_web_examples.js:540
logError @ druid_web_examples.js:230
imports.wbg.__wbg_error_4bb6c2a97407129a @ druid_web_examples.js:538
$console_error_panic_hook::error::hae6c3eae4d1d18ab @ druid_web_examples_bg.wasm:0x15fd072
$console_error_panic_hook::hook_impl::hc41ff54987f5ee4c @ druid_web_examples_bg.wasm:0x127e238
$console_error_panic_hook::hook::h126545eb1cc05067 @ druid_web_examples_bg.wasm:0x194af37
$core::ops::function::Fn::call::h84dc32ea5da66069 @ druid_web_examples_bg.wasm:0x18dbc53
$std::panicking::rust_panic_with_hook::he9bfe03219d715ba @ druid_web_examples_bg.wasm:0x14f5d8f
$std::panicking::begin_panic::{{closure}}::h29d8e4472f2e2dbe @ druid_web_examples_bg.wasm:0x1979a0f
$std::sys_common::backtrace::__rust_end_short_backtrace::h07554449d90848f3 @ druid_web_examples_bg.wasm:0x1966277
$std::panicking::begin_panic::h7867d4da632f3661 @ druid_web_examples_bg.wasm:0x19799e1
$std::sys::wasm::time::Instant::now::h301019f3e66af852 @ druid_web_examples_bg.wasm:0x1993a39
$std::time::Instant::now::h4e5f28084bc792e8 @ druid_web_examples_bg.wasm:0x19941d3
$druid_web_examples::examples::game_of_life::make_widget::h9f3a830da4690ea3 @ druid_web_examples_bg.wasm:0xca2906
$druid_web_examples::examples::game_of_life::main::h88461766875a962e @ druid_web_examples_bg.wasm:0xecde89
$druid_web_examples::game_of_life::hdbc630ad673779e9 @ druid_web_examples_bg.wasm:0x1979bd1
$game_of_life @ druid_web_examples_bg.wasm:0x1959dfe
game_of_life @ druid_web_examples.js:324
run @ game_of_life.html:25
await in run (async)
(anonymous) @ game_of_life.html:28
druid_web_examples_bg.wasm:0x19943ae Uncaught (in promise) RuntimeError: unreachable
at __rust_start_panic (druid_web_examples_bg.wasm:0x19943ae)
at rust_panic (druid_web_examples_bg.wasm:0x197a365)
at std::panicking::rust_panic_with_hook::he9bfe03219d715ba (druid_web_examples_bg.wasm:0x14f5db6)
at std::panicking::begin_panic::{{closure}}::h29d8e4472f2e2dbe (druid_web_examples_bg.wasm:0x1979a0f)
at std::sys_common::backtrace::__rust_end_short_backtrace::h07554449d90848f3 (druid_web_examples_bg.wasm:0x1966277)
at std::panicking::begin_panic::h7867d4da632f3661 (druid_web_examples_bg.wasm:0x19799e1)
at std::sys::wasm::time::Instant::now::h301019f3e66af852 (druid_web_examples_bg.wasm:0x1993a39)
at std::time::Instant::now::h4e5f28084bc792e8 (druid_web_examples_bg.wasm:0x19941d3)
at druid_web_examples::examples::game_of_life::make_widget::h9f3a830da4690ea3 (druid_web_examples_bg.wasm:0xca2906)
at druid_web_examples::examples::game_of_life::main::h88461766875a962e (druid_web_examples_bg.wasm:0xecde89)
$__rust_start_panic @ druid_web_examples_bg.wasm:0x19943ae
$rust_panic @ druid_web_examples_bg.wasm:0x197a365
$std::panicking::rust_panic_with_hook::he9bfe03219d715ba @ druid_web_examples_bg.wasm:0x14f5db6
$std::panicking::begin_panic::{{closure}}::h29d8e4472f2e2dbe @ druid_web_examples_bg.wasm:0x1979a0f
$std::sys_common::backtrace::__rust_end_short_backtrace::h07554449d90848f3 @ druid_web_examples_bg.wasm:0x1966277
$std::panicking::begin_panic::h7867d4da632f3661 @ druid_web_examples_bg.wasm:0x19799e1
$std::sys::wasm::time::Instant::now::h301019f3e66af852 @ druid_web_examples_bg.wasm:0x1993a39
$std::time::Instant::now::h4e5f28084bc792e8 @ druid_web_examples_bg.wasm:0x19941d3
$druid_web_examples::examples::game_of_life::make_widget::h9f3a830da4690ea3 @ druid_web_examples_bg.wasm:0xca2906
$druid_web_examples::examples::game_of_life::main::h88461766875a962e @ druid_web_examples_bg.wasm:0xecde89
$druid_web_examples::game_of_life::hdbc630ad673779e9 @ druid_web_examples_bg.wasm:0x1979bd1
$game_of_life @ druid_web_examples_bg.wasm:0x1959dfe
game_of_life @ druid_web_examples.js:324
run @ game_of_life.html:25
await in run (async)
(anonymous) @ game_of_life.html:28
```

Wasm-pack - 0.10.1
os - Mac OS X - 11.6.2
rustc - 1.55.0
druid - hash 9bfdaf8
server - http
browser - Chrome (same result with Safari, BTW).

LMK if I can help fix it.

Start at the game_of_life::make_widget entry point shown in the stack trace and inspect the use of std::time::Instant::now. Run game_of_life.html in a browser through the reported HTTP setup and confirm the example no longer panics with the unsupported wasm time error.

Written by the indexing model from the issue text.