* Preliminary MSYS2 + MinGW build scripts and instructions.
* CMakeLists.txt: MinGW tweaks, enforce C++03, suppress warnings for now.
* Fix some GCC warnings.
* Fix unused parameter warnings coming from Ifc*.h.
* Fix warning regarding unreachable code (++jt) on MSVC.
* Add IfcParse_EXPORT for IfcInvalidTokenException
* Fix potentially uninitialized pointer variables.
* Note about OpenCASCADE cyclic dependencies fix.
* GCC warning fix: don't generate 'current_enum' variable that is only set and not used for anything ever
* Work around -Wmaybe-uninitialized warnings about boost::optional constructs. Also prevent passing of negative values for --bounds.
* Remove unused variable.
* CMakeLists.txt: ENABLE_BUILD_OPTIMIZATIONS for GCC (simply enforce -03)
* Applied MSVC tabify to IfcParse.cpp/h.
* Now Argument base class has throwing implementation for each conversion operator (removed those from derived classes).
* Added NullArgument class for the case when null arguments appear after setting elements.
* Now operator tokens are handled just like any other token.
* Refactoring: Token is now a struct with good fields, not a nameless pair.
* Now end position of token is set at its construction.
* Now type of token is determined on construction, as* function simply check stored type.
* Now int-s, float-s and some etc are parsed when token is created.
* Implemented simple way to remove spaces in parsing.
* Tokens are now created without allocations.
* Call RemoveTokenSeparators once for every token.
* Added temporary std::string object in lexer (for optimization purposes).
* Reimplemented asString without allocations.
* Parsing keywords without allocations.
* Added checks for type to tokenFunc::as*** functions.
Thomas Krijnen