* works for cornell now, will be extended to import others
* works for all scenes
* can load environments and blur them
* minor cleanup
* Example commands added to README.md
* feat: load exr map
* feat: scale and flip the hdr map
* feat: added camera
* feat: add simple slow but working photonmapping
* feat: added cpp version of photonmapping
* arg parsing, minor name changes and fixes
* reqs returned, scene and env added as args to rendering (not doing anything yet)
* added folders for scenes and envs
* added folders for scenes and envs (now they actually appear on GH after adding readmes)
* added varying spheres amount
