Contributor sign-offs: flow3r/flow3r-firmware#34

This update brings some fixes to excluding miniz from build and
enabling binary search for glyphs in the internal font engine.

Also make licensing clearer, ctx.h itself which is in this folder is
licensed under LGPLv3+, it is the micropython bindings - uctx which
live in ../micropython/usermodule/mp_uctx.c which are MIT licensed.

This is an annoyingly large change, but the gist of it is that we:

1. Move ctx into components/ctx
2. Move uctx into usermodule/mp_uctx.c
3. Split out uctx config into ctx_config.h and share it with the
   simulator.
4. Delete a bunch of unused ctx files
5. Flip some ctx bits for speed.
6. Draw the rest of the owl, ie. implement a dedicated rasterizer task
   in components/st3m.