issue #2771: implements rayCast and rectQuery
issue #2771: add ray cast test
issues #2905:add SimpleGame vs-project
Merge pull request #3993 from minggo/iss2905-adjust_folder

Samples build ok on linux
Merge pull request #3992 from Dhilan007/di2905

issues #2905:add SimpleGame vs-project
issue #2771: fix some compile error in android and win32
issue #2771: fix some compile error in win32
issue #2771: add resource
Merge pull request #3996 from boyu0/iss2771_physical

issue #2771: physical
issue #2905: android samples run ok