save as, autosave, user-friendly file format, rendering bug fix, load-save-load-save bug fix, build improvements, code quality improvements

- merged Core and Native projects
- removed the use of tabs in many places (the standard in the Mojo codebase is 4 spaces instead of a tab)
- refactored saving and loading systems to support save as, auto-save, and a more user-friendly file format
- moved SQLlite to SDK folder
- added TinyText library (which had been previously removed due to 64-bit issues)
- added support for one-click 32-bit and 64-bit builds