v7.3

- Build changes:
  - Vendor test.h so people building from the release tarballs doesn't
    have to clone that repository with git

v7.2:

- Fixes:
  - Stopped compton from sometimes freezing the X server when dbus is
    enabled.
  - Fixed the example dbus scripts.

v7.1

- Fixes:
  - Fixed yshui#209
  - Fixed assertion failures, bugs, and memory leaks in experimental
    backends

core: destroy debug window in session_destroy

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

gl_common: use texelFetch

This relieves us from the need to normalize texture coordinates.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

new backend: ignore window tranparency info from the backend

Doing this forces compton to blur every windows' background.

However, doing this can be beneficial, we will figure out a way
to do this properly in the future.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

Stop debug mode from being used without the new backends

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>