6959197: When building with JAVAC_MAX_WARNINGS=true, the build fails in sun/nio/cs due to the use of -Werror
Summary: Remove unneeded casts, add generic types and make better use of static data
Reviewed-by: sherman

Reviewed-by: darcy, weijun

6911753: NSN wants to add Big5 HKSCS-2004 support
Summary: support HKSCS2008 in Big5_HKSCS and MS950_HKSCS
Reviewed-by: okutsu