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wayland: Protect against enter events for empty surfaces

Closes #17

See merge request !14

The `leave` handler checks for NULL surfaces, but the `enter` handler
does not.

Fixes: #17

Build fixes

See merge request !13

Older versions of Meson do not deal with concatenation between mixed
values very well.

Don't use something from ancient times, even if we haven't touched
Clutter in a long while.

Use non-deprecated syntax to generate the main pkg-config file; then,
generate all the backend-specific pkg-config files by simply depending
on clutter-1.0.

Let's use what Debian stable provides.

The `install` argument for configure_file() is not needed if set to a
`true` constant value while passing `install_dir`.

Cannot go to a new line in the middle of an if.

Handle 8 and 10 bits colour depth in picking code (#11)

See merge request !10

transition: Don't split reference counting with actor

See merge request !12

ClutterActor took a reference in its transition 'stopped' handler,
aiming to keep the transition alive during signal emission even if it
was removed during. This is, however, already taken care of by
ClutterTimeline, by always taking a reference during its 'stopped'
signal emission, so no need to add another one.

This also has the bonus of making reference ownership simpler, as well
as avoidance of double free if an actor was destroyed before a
transition has finished.

Note that we're in deep maintenance mode, to avoid people submitting bugs or
merge requests with new features.

docs: Add missing settings.ini Environment group keys

See merge request !8

meson: Don't use undocumented -export-dynamic option

See merge request !9

clutter/actor: Mark implicit transitions as remove-on-complete

See merge request !11

Implicit transitions had a referenced taken while emitting the
completion signals, but said reference would only be released if it was
had remove-on-complete set to TRUE.

Change this to instead remove the 'is_implicit' state and mark all
implicit transitions as remove-on-complete.