Merge pull request #44 from Earnestly/master

man: Document WLC_XWAYLAND.
Check for valid list pointers.
Update wlc.
Update wlc
Move client activation on space to own function.
Fix focus steal when moving client to another space.
Update wlc
Add buildhck link to readme
Move highlight on monitor the client was moved from.
Constraint dialog to minimum size.
Link against math library
Update wlc
Update wlc