ALL: Rename Debugger::DebugPrintf to Debugger::debugPrintf.
ALL: Rename Debugger::DVar_Register to Debugger::registerVar.
ALL: Rename Debugger::DCmd_Register to Debugger::registerCmd.
GUI: Slight naming cleanup in Debugger.
ALL: Make Debugger command function names conform to our guidelines.
GUI: Don't endorse function naming against our guidelines in docu.
VOYEUR: Don't overwrite "exit" command in the debugger.

It actually overwrite "exit" by cmdExit and thus effectively the same command...
KYRA: Adpot debugger command function naming to match our guidelines.
ALL: Introduce typesafe Debugger::registerVar functions.

This also adds a FIXME to SCI which registered an enum type as int...
GRAPHICS: colour -> color in VectorRendererSpec code.