Project uses spaces and tabs for indentation

[berikv]

I would suggest to use four spaces, but don't want to start a war over it :)
If tabs are the way to go, then lets convert all spaces to tabs in the remaining .c and .h files.

[NagyD]

I changed spaces to tabs where they were used for indentation (as opposed to aligning).
I didn't change the external libraries, though (src/opl3.c, src/opl3.h, src/stb_vorbis.c).

[berikv]

How would you feel about moving the external libraries to eg src/vendor/ and having a formatter / validator script in the project to fix the tabs / spaces?