AR Pipeline Improvement

[jheo4]

1. Modify cmakes for profiling
   • Add PROFILE as a preprocessor option
   • Add build option macro in cmake
2. Fix memory leaking from cv::Mat
   • Add mxre::cv_units::Mat which is mem-leak safe
   • Update examples with mixer mat and check mem leak
3. CUDA ORB detector
   • Add cuda_orb_detector
   • Add an example of cuda detector
4. Add profiling
   • Update cmake profile option
   • Add profiling codes to each component
5. Reduce rendering latency
   • Remove mipmap generation from background texture
6. Improve AR objects with assimp
   • Update CMake with Assimp and STB
   • Add CMake config for project dir
   • Refactor project structure: test->examples
   • Compartment gl headers and add profiling func
   • Refactor proj arch: src with gl
   • Add profiling to MIXER kernels
   • Add mesh/model/shader GL data structure for Assimp
   • Add OGL camera for better projections
   • Add vertex and fragment shaders of GL model/mesh
   • Add path_finder for finding 3D resources
   • Update object_ctx_extractor with glm and 3D models
   • Add checking for gl/egl inits
   • Add AR world and object
   • Update renderer with AR worlds and objects
   • Add a pointer to resources and modify gitignore