Replace all catch all (_ => {}) with panic

Catch all are source of bugs. They should be panics. Add a lint that errors for catch all.

Here is output of git grep _ =? {} but there might be more.

src/codegen/lower/seam_cert.rs:148:        _ => {}
src/codegen/lower/seam_cert.rs:180:        _ => {}
src/driver.rs:1053:            _ => {}
src/formatter.rs:68:            _ => {}
src/hir/check/calls.rs:324:                    _ => {}
src/hir/check/control.rs:265:            _ => {}
src/hir/check/control.rs:285:                        _ => {}
src/hir/check/operators.rs:172:            _ => {}
src/hir/check/raw.rs:1044:            _ => {}
src/hir/check/raw.rs:1784:                    _ => {}
src/hir/check/transfer.rs:97:                _ => {}
src/hir/check/transfer.rs:132:            _ => {}
src/hir/check/transfer.rs:663:            _ => {}
src/hir/check/transfer.rs:684:                _ => {}
src/hir/env.rs:462:            _ => {}
src/hir/env.rs:693:                        _ => {}
src/hir/env.rs:858:            _ => {}
src/hir/env.rs:939:            _ => {}
src/hir/expr.rs:90:                _ => {}
src/hir/expr.rs:256:            _ => {}
src/hir/flatten.rs:4950:                _ => {}
src/hir/flatten.rs:5036:            _ => {}
src/hir/flatten.rs:5089:                _ => {}
src/hir/flatten.rs:5173:            _ => {}
src/hir/flatten.rs:5559:            _ => {}
src/hir/provenance.rs:226:            _ => {}
src/hir/provenance.rs:258:            _ => {}
src/hir/stmt.rs:75:                _ => {}
src/hir/stmt.rs:875:                _ => {}
src/ide/mod.rs:341:                    _ => {}
src/parser/expr.rs:85:        _ => {}
src/parser/macro_expand.rs:245:            _ => {}
src/parser/macro_expand.rs:397:            _ => {}
src/pipeline.rs:563:        _ => {}
src/syntax/resolve.rs:225:            _ => {}
src/syntax/resolve.rs:304:            _ => {}
src/syntax/types.rs:771:            _ => {}