Make posters dyeable (should be backward-compatible with existing ones)

[yl-whosit]

• set signs param2 to colorfacedir
• make signs use a color palette and hardware coloring
• add poster coloring crafting recipes and optional depend on dye
  

[Niklp09]

I like this!

Would be nice if you could try to follow the code style of the project, it looks broken both in codium and on gh.

Compress the new textures, they're unreasonably large.
I usually use

alias op='find . -type f -iname "*.png" -not -iname "screenshot*" -exec optipng -o7 -zm1-9 -nc -strip all -clobber {} \;'

[Niklp09]

Why not use xcompat?
Supported dye items: https://github.com/mt-mods/xcompat/blob/8d6e82cfdbbc84bdb63791caa05376c01bb83275/src/materials/minetest.lua#L28-L42

[Niklp09]

I'd go w/ shapeless, since using shapeless crafting isn't a performance problem anymore. (you decide:)

Suggested change

	minetest.register_craft({
	type = "shaped",
	output = minetest.itemstring_with_palette("signs:paper_poster", (i-1) * 32),
	recipe = {
	{ "signs:paper_poster", dye, "" },
	{ "", "", "" },
	{ "", "", "" },
	}
	})
	minetest.register_craft({
	type = "shapeless",
	output = minetest.itemstring_with_palette("signs:paper_poster", (i-1) * 32),
	recipe = {"signs:paper_poster", dye}
	})

[yl-whosit]

Sorry about space/tab mix, I had to hunt down those spaces using emacs whitespace-mode - should invest some time so it at least gives me a warning... (also: I could not see any indentation issues anywhere - even github showed it like properly formatted :/)

Please tell me if there are any other issues.

Also please squash :D

[yl-whosit]

I'm also now wondering if those textures are a little too rough, and should be made a smidge lighter (seemed to fit "medieval" theme we have on YL :p)

[Niklp09]

You don't have to check for xcompat as it is a hard dependency, LGTM otherwise.
Thanks!

[yl-whosit]

Oops, fixed.