- according to c++ standard, single void in function parameter is equal to empty parameter list. for removing this syntax which may cause misunderstanding (becuase in C, they are different I guess), I replace all `(void)` to `()`.
- add basic class layout and member function for CKLight and CKCamera.
- register CKLight and CKCamera in CKGlobals to let CK engine can recognize them.
- modify EnumsMigration to add new 2 enums for CKLight and CKCamera.
- fix the wrong reference in CMake script which install lib target into wrong directory.
- add file, change CMake script and modify header file for preparing develop of CKLight and CKCamera.
- fix doc typo.
