avr.cfg: Added support for more functions.
Speedup checking large amounts of arrays (#5615) by avoiding Token::Match calls in CheckBufferOverrun::checkScope(2).
-> Decreased entire checking time on a subset of the attached file by 66% (MSVC12, x64, non-matchcompiled)
Refactorizations optimizing std::string usage:
1) Added global static const std::string emptyString; object:
-> Replaces some static variables in functions which might be not threadsafe
-> Avoids constructor call (std::string::string(""))
-> Even functions that return an empty string in some branches can return by reference now.
Added to config.h to ensure that it is available everywhere

2) Added overloads for TestFixture::assertEquals for the most common use cases:
-> Moves conversion from const char[] to std::string into a function, reducing code duplication in binary.
Store Token::_originalName on heap, since it is only used for a small amount of Tokens (reduce memory usage of TokenList by ~12% (x64))
Updated WiX installer and VS solution to VS12 and Qt5
Refactorizations optimizing std::string usage.
Visual Studio: Use testsuite.h as precompiled header (compiled into testrunner.cpp)
-> Reduces build time of project testrunner by 13 seconds (16%)
Refactorization: Moved condition in Token::tokAt() out of loop.
Keep console open in testrunner
Use C++11 std::sto* instead of std::ato* where appropriate (emulated in cxx11emu.h)
Added AST validation