Recognize more warning patterns.

* add more Java, Kotlin, and Rust warning patterns
* recognize more clang-tidy cert-* and bugprone-* warnings;
  still keep the catch-all 'cert' and 'bugprone' groups.

Test: warn.py build.log > warnings.html
Change-Id: I909ec09822f42f60493ebe943c055bf0d4b69938