- Added ui button, basic but also centers text automatically, IT IS SLOW
- IN PROGRESS: adding a drop down select box

- Moved a lot of items into separate header files
- Still compiling everything as a single translation unit (but maybe a
  heavier translation unit [if that is possible])
- setup compile_flags, a way to use clangd without using a build system
- stuff like clangd and cmake don't work well with unity builds, so I
  avoid jumping through hoops

- position now starts from left bottom corner, to make drawing easier
- moved quad rendering functions to their own files