Whiteboardfs is a collaborative drawing file system.

Dependencies:
optional for dryerase -c
https://git.sr.ht/~amavect/makeu
https://git.sr.ht/~amavect/pal

Install:
mk install

It consists of 2 files in the tree.
canvas is the image to draw to. 
	On read, it returns a RGB24 image.
	To write, write a RGBA32 image, which will be composited SoverD.
update notifies of any changes.
	On read, it returns 1 character and then blocks.
	If a write completes, another character is sent.

Dryerase is a program meant to interface with whiteboardfs.
dryerase -c will start it connected to makeu
See man page for usage.

TODO:
make whiteboardfs understand multiple image types