[analyzer][NFC] Use capital variable names, move methods out-of-line, rename...

[analyzer][NFC] Use capital variable names, move methods out-of-line, rename some in CheckerRegistry

There are barely any lines I haven't changed in these files, so I think I could
might as well leave it in an LLVM coding style conforming state. I also renamed
2 functions and moved addDependency out of line to ease on followup patches.

Differential Revision: https://reviews.llvm.org/D59457

llvm-svn: 358676