Rename all scopes and make it build under new name.

Adds a GitLab CI configuration file to run checks on branches and merge
requests. This includes a linter for the commit messages, final build of the
branch. In the future also the autotests could be run.

The 'ci' type is added to the list of allowed commit types.

We already save the scale of an output in its control file. Also read it from
there now.

This fixes scale setting with the KWinFT backend.

Disman's Output API changes in a breaking way. Adapt to these changes.

In config files traditionally we only had a list of all outputs. This concept
is not extensible.

Start with a map, then we can add other keys later on if need be.

Save config files into the subfolder 'configs'. Old config files are not read
anymore by that but since the overall path is changed with the app rename
anyway this is of no concern.

In case a scale value is not found in the control file fall back to a
scale value of 1.

This issue was discovered through an autotest.

The question is if this case is useful in any way. Autotest assumes it is
possible so return gracefully for now on Control ctor.

But in the long run we might rather opt for just not allowing it.

The comment says that in case no lid-open file is available we will just
call applyConfig(), but the current code did not do that. Let's do that
now since doing that instead of just doing nothing is making sense.

This makes all tests pass again. Earlier commits made some adjustments to the
test data necessary.

Additionally the config test was reworked since there were some obvious issues
with it. For example the temporary config directory leaked from one test to the
other. Now it's purged after each test that writes to it with a RAII object.

Adds a test stage to the CI pipeline running all available autotests for merge
requests and when pushing to a branch.

This way the format is recognized by text editors and the json syntax is
highlighted.

Initial improvements to configuration handling

Closes #1

See merge request !1

Add release scripts for beta, stable minor and stable patch versions. Adapted
from respective KWinFT scripts.

When we build a tag we are on a stable branch only or at the moment of
splitting one out. In these cases we must do a stable build.

Also disables the compliance check on tag build.

On tag and stable branch build checkout Disman's stable branch for building it.

Update changelog and raise CMake project version to 5.18.90.