Default Templates

Could we have default templates for the different analyzers bacon supports?

e.g.
```shell
bacon --init --cpp
bacon --init --python
bacon --init --js
```
or:
```shell
bacon --init --analyzer cpp
bacon --init --analyzer python
bacon --init --analyzer js
```

default being rust.

Or even better supporting build systems for C++:
```shell
bacon --init --meson
bacon --init --cmake
bacon --init --scons
...
```