Add new compiler warning patterns

* Add Kotlin, NDK, Protoc, Asm, and other new patterns.
* Put all clang-analyzer warnings to the ANALYZER severity group.
  Some security and null pointer warnings still have HIGH severity.
* Comment out old C/C++ warnings that overlap with analyzer
  warnings and do not appear in current build.log.
* Other old fixed warning patterns should be commented out later.

Bug: 141493530
Test: warn.py --url=http://cs/android --separator='?l=' build.log > warnings.html
Change-Id: Idc7b09e5e4eefa127d41e9f37da1f566ed1ede1f