enable pointer on layer surfaces

more TODOs

fix focus leave condition

needs refactoring and testing

send pressed keys to topmost layer surface

update README

remove blank line

don't handle failed calloc

be consistent with the rest of the code

order variables more how like they are initialized

simplify make clean

Reuse render() and struct timespec *now

reuse m->m

remove comment

wlr_output_layout_get_box internally calls
wlr_output_effective_resolution

set a monitor geometry only when creating it

Lets layers with an exclusive area shrink the usable area

render in the same order as sway

update make clean

correct variable name

rename functions too

remove extra space

render layer surfaces

improve naming

rename Layer to LayerSurface; layer should refer to overlay, top, bottom
or background
LayerSurface variables are always called layersurface
wlr_layer_surface_v1 variables are always called wlr_layer_surface