Update to latest wlc, specify which version to use for future build scripts

[SnirkImmington]

This will fix Immington-Industries/way-cooler#52 which is caused by a bad wlc version. Because we will lag slightly behind wlc's versions (or more if we're focused on way-cooler) and a future version could break backwards-compatibility, we need to make sure we're quickly up to date (especially with rolling-release package managers like the AUR).

Changes since 0.0.2

Ignoring changes to wlc_event_loop_add_fd and X11 support from CMake

• [x] Add view properties updated callback (handled in #44, let's double check)
• [x] Add view properties updated bitmask (wlc.h:59-65) - confirm if it's in #44

Changes since 0.0.3

Conveniently includes UTF-8 titles and not sending buttons presses on scrolling.

However, we may need to see if this breaks modal view rendering with "do not transform child views automatically."

• [x] Add support for surface/output scale - wlc_output_get_virtual_resolution to be used everywhere else

Changes since 0.0.4

• [x] wlc_view_get_pid - it returns a pid_t