Improved trigger of audio chanels

See merge request !22

Initial working version of Audio CH4

See merge request !21

The all trigger was missing calls to channel 2 and 4.

This issue was prevent CH4 from working properly.
Also added TODO operations to the master volume.

The implemenation seems correct but is yet to be tested.
The coding of LFSR still needs auditing.

Better represents the original name of the test suite.

More testing included.

This allows better understanding of the ROMs and their purpose.

This allows automated CI/CD for production deployments.
Major development effort .

Dupport for waveform plotting

See merge request !20

Also fixed small channel 3 issue

The selection mode was being returned with an inverted value.

Merge branch 'joamag/audio-ch4' of ssh://gitlab.stage.hive.pt:2222/joamag/boytacean into joamag/audio-ch4

Also avoid problem with processing extra 15th byte of the title for situations where the CGB flag is present.