This commit adds an output struct which abstracts the X11 specific
functions and makes it possible to easily create a drop-in wayland
output.
It also fixes a bug in wayland where notifications won't disappear.
This is because wayland doesn't give access to user input when a
client is not in focus. This way it seems like the user is always
idle. The idle functionality is now disabled in Wayland until proper
support is added.
Move the main window reference from xctx to draw.c and at the same time
make each X11 function that modifies the window require the pointer as a
parameter. This makes it easier to implement features that require
multiple windows.
Setup the initial template for draw.c to be between X11 calls and the
rest of the codebase. This prepares the file to move all the drawing
related function here in the next commit.
