Get rid of TODOs

[fs-c]

Occasionally I add code that I know will have to be rewritten sometime soon (tm). I'm opening this issue to

• keep track of these instances, since I don't always add a TODO note in the relevant place
• keep a list of existing TODOs that I can work my way down of

$ git grep "TODO"
src/config.h:   // TODO: None of the text breaking functions handle newlines.
src/config.h:   // TODO: This is ugly and prone to bugs.
src/config.h:   // TODO: This should be more general.
src/osu/osu.cpp:        // TODO: Run this in parallel.
src/osu/osu.cpp:        // TODO: This pile of shit is copied pretty much straight from maniac 0.x and needs to
src/osu/osu.cpp:// TODO: Break up into smaller functions, this is ugly as all hell.
src/osu/osu.h:  // TODO: Generic pointers are bad in the long run.
src/osu/osu.h:  // TODO: Look into KEYEVENTF_SCANCODE (see esp. KEYBDINPUT remarks section).
src/osu/osu.h:  // TODO: Magic numbers are a bad idea.
src/process/process.h:          // TODO: Get rid of this ASAP once std::format is out.
src/process/process.h:          // TODO: See above.

[fs-c]

Some points that aren't on the above list

• The distinction between stuff that should be done in the maniac namespace and stuff that should be done in main.cpp is unclear.
• I dislike how the whole osu::internal thing is handled, there should be a nicer wrapper around the raw structs.