default.lua: remove empty if branches

Add build instructions to README

default.lua: remove comments at bottom of file

Change a word in the docs lol

Fix function signature in README

Remove unused macro

Update README

Fix wraparound when cycling through debug options

Make README header a tiny bit prettier i guess

Add Lua API stuff to README

Deduplicate game.die in default.lua

Fix x_repeat_level on castle levels

Save PBs in time attack

Fix game.write text size consistency

Disable *all* midways/checkpoints in time attack

Implement x_time_attack (shittily)

Don't show midways when x_no_midways is enabled

Improve mtype comment

Remove unused variant of setfont

Hide player message when respawning