- refactor VxVector-like struct. split their declaration and implementatio because their implementation is too long. and occupy too much space in header.
- refactor VxVector struct generator. use jinja2 template engine, rather ran hand-written format string to make it is easy to read (although it still tough when first reading).
- add unary operator overloading for VxVector-like struct.
- add some VxMatrix functions which are essential to CKCamera.
- rename VxMatrix::ResetToIdentity to VxMatrix::SetIdentity to make it same as original Virtools SDK.
- the spaceship overloading with auto return value still may have bugs. please watch it carefully.
- move EnumsHelper into YYCC because it is widely used.
- rename all calling to EnumsHelper due to this modification.
- add version checker in code to make sure that user use correct YYCC library to compile.
- modify some include syntax because the include directory layout changes of YYCC.
- update CMake script to resolve the bug that we can not export LibCmo (thanks doyaGu and BLumia).
