Updated pelite

* Added a resource walker
* Added pelite::ImageBase() to get the HMODULE of the currently executing code
New and improved mathlib.
Cvar thunk template.
Improved EnumString globals (auto-constructed by the compiler, globals disappear if not used)
Added printf overflow test case.
Exposed IsInitialized() (FIXME! Just rethink the design)
Improved StackFrame interface.
Minor changes to strcrypt.
Major PeFile refactoring.
Small change since I don't need PeFile features here...
PeFile: Added constructor (with implicit support) for ease of use.
Scanner: removed arbitrary scan range input.