This has some advantages:
- Less stuff to download for building Gadgetbridge (CI Speedups)
- Shorter build time (no need to build shared library for all supported architectures)
- Easier debugging
- etc :P
What I did:
- remove all curves except B163 to make porting easier
- port to java with brain switched off
- fix the "java has no unsigned" bugs
- add some helpers to convert int[] to byte[] and back because java has no casts
The result is ugly, no one would write such crappy code from scratch, but I tried to
keep it as close to the C code as possible to prevent bugs. Since I did not know what
