Fixed remaining VS warnings (hopefully all of them, this time)
Fixed incorrect usage of startOfExecutableScope() (Checking time reduced by ~60% (nonlinear) for #5876)
#5895 - Fixed potential signed integer overflow in Checkother:getvalue. Added regression test.
Refactorization in timer.cpp (#5902), Removed misleading comment in symboldatabase
Improved testing of AST, added unit test for #5787