feat: Proper Editor

[ashifolfi]

Rebase of #38 on a fresh slate (it really needed it)

ToDo:

• [ ] Resplit editor into separate cmakelists
• [x] Port over WIP Model Editor Panel
• [ ] Scene Editor
• [ ] Material Editor
• [ ] Texture Editor
• [ ] Asset Manager
• [ ] Tools Manager

[ashifolfi]

what if I just closed this and we just made individual pull requests as we complete various panels.