Standardize C style with clang-format

[Rangi42]

Based on pret/pokecrystal#1205

There are probably more useful properties we could copy from the clang-format docs or rgbds. It will likely also need tweaking after trying to format the other tools in pokecrystal.

The 200-character line length is unnecessarily long, but going down to 100 or 120 or even 140 causes some wrapping in deeply-nested complex for loops that we may not want.

Some changes cannot be made by clang-format (except maybe the bleeding-edge latest version), so must be done manually, including:

• Insert trailing comma after the last item in a wrapped long sequence (e.g. the {0} at the end of long option arrays or inline enum declarations)
• To wrap long function parameters with one parameter per line, you need // clang-format off