Ch5xx spi st7735 demo

[unicab369]

No description provided.

[cnlohr]

@unicab369 please put the header files here into the folder of the demo. They're not ready for extralibs.

[cnlohr]

Also, for all of them, even if not in common, please start using int or uint32_t etc... instead of u8 when int would do. It really makes the code more bloated and slower unnecessarily to use u8 or u16 unless you are actually doing something with arrays, etc. that are of the specific sizes.

[unicab369]

@cnlohr I moved the files and make sure it built. I have to revisit this later to update the variable types and make sure it's still working.

[cnlohr]

Sorry, I also realized a few things.

1. I believe we already added a struct definition for the SPI for the CH5xx
2. Please add documentation for where the font5x8 came from.