[x] use system lua lib
[x] make it std=c11 not gnu11
[ ] make it compile on openbsd
[ ] update license, readme and documentation
[ ] add manpage
[x] add desktop file
[x] makefile: add install and uninstall
[ ] makefile fix permissions of installed data dir
[ ] SDL: disable key not recognized messages
[ ] font: use system fonts
[ ] font: implement hashmap of already rendered glyphs and only re-draw the
          ones that are not in that map
[ ] font: resize text on the fly
[ ] ui: change ui scale on the fly
[x] add menu to exec arbitrary command -> added console
	[ ] that command can be what is selected
[ ] console: accept input
[ ] doc: detect file changes with hash
[x] add horizontal scroll
[ ] add a cross to close tab
[ ] add context menu to various things
	[ ] document and selection context menu
	[ ] treeview context menu
	[ ] tab context menu for close duplicate etc
[ ] prevent overscrolling on treeview
[x] user config file and/or init.lua
[x] change tmp directory to somewhere in /tmp
[x] save project directory and restore on reopening
[ ] optimize dir tree taking too long to load on big folders
[ ] SDL: optimize drawing operations
	[ ] implement render queue for each frame and render in batch, this
	    should save some time and improve cache locality
[ ] syntax: do not reload syntax on every draw event
[ ] go in background when launching from terminal
[ ] some key bindings:
	[x] alt+right == End
	[x] alt+left == Home
	[x] alt+up == PageUp
	[x] alt+down == PageDown
	[ ] ctrl+d == duplicate line
	[ ] ctrl+x == cut line || selection
	[ ] ctrl+c == copy line || selection
	[x] ctrl+shift+o == change & open project folder
	[x] ctrl+q == quit
	[x] ctrl+n -> next_find
	[x] ctrl+shift+n -> prev_find
	[x] f3 -> new file
	[x] selected + tab == indent up
	[x] selected +shift+tab == indent down
[x] change alt+<number> to ctrl+<number>
[ ] add multi cursor system
[ ] add binding to open up a cheatsheet of keybinding, with a
    search feature
[x] implement visual "ruler" at column 80
[ ] show hidden files config and binding
[ ] syntax: highlight FIXME TODO BUG FIX and IMPROVEMENT keywords
[ ] do not open doc in new tab if current tab has an unchanged document
[ ] doc: add auto close brackets and quotes
[ ] view: implement get_scrollable_size()