Experimental direct threading

Opt-in with macro BEER_BC_DISPATCH_DIRECT
Classes update

Removed XyzClass and merged them with Xyz;
Got rid of some nasty macros;
stdlib update
Value types initialised in ctors;
Multiple entry points support;
Performance update;
Merge branch 'master' of https://github.com/maca89/Beer

Conflicts:
	Beer.v11.suo
	VirualMachine/VirualMachine.vcxproj
	VirualMachine/VirualMachine.vcxproj.filters
	VirualMachine/VirualMachine.vcxproj.user
	VirualMachine/sources/Bytecode.cpp
	VirualMachine/sources/FileReader.h
	VirualMachine/sources/FileWriter.h
	VirualMachine/sources/StringClass.h
	VirualMachine/sources/Thread.cpp
	VirualMachine/sources/Thread.h
	VirualMachine/sources/VirtualMachine.cpp