#261
After evaluating lightweight OBJ parsers I attempted migrations to both RapidObj and TinyObj.

Key Findings:

• Both libraries lack scene graph/hierarchy support and submesh concepts
• To use this library we have to make patches to include:
  Scene graph generation and Material-based submesh splitting

Todo if this experiment works

• Remove submodules for asimp and rapidobj
• investigate and implement necessary preprocessing and post-processing features for rapid/tinyobj
• clean code and Update Readme