When releasing the mouse button outside of the popup while dragging
a slider, the slider still gets adjusted by mouse-move events.
The reason for this bug is that the mouse-up event is sent to the
focused window (main editor window) instead of the colorpicker
popup window.
This PR adjusts the linuxbsd X11 DisplayServer to send the event to the
correct expected window.
The loaders have been generated through hpvb's dynload-wrapper, although
they had to be heavily handpatched to workaround some already reported
issues with it. I added a note to each generated file to account for
that.
As GLAD uses X11 stuff directly, I had to define the GLAD_GLX_NO_X11
macro to not let do it that, and handle myself the display loading and
screen handling part myself, which wasn't that hard but it's still
something worth saying.
I plan to improve greatly the X11 backend (including this aspect) but,
as the release isn't that far and I'm also working on the Wayland
backend, this will do for now, I hope.
