As discussed in 2008
(http://www.freelists.org/post/haiku-development/BString-on-GCC4,1),
this class was not efficient because of lack of inlining. Implement the
suggested solution of a SetCharAt method instead. Also add a CompareAt
which covers a specific use case in KeyboardLayout.cpp.
Adjust all places which were using this feature to safer APIs.
Also fixes a copypaste error in FormattingConventions.cpp.
Adrien Destugues
3eac8208df