Sensomusic updates Usine to v5.50.55

Sensomusic has updated Usine to version 5.50.55.

Improvements:

• [library] new DJ delay II patch.
• [library] new DJ Hold patch.
• [usine] MIDI learn are memorized during the apply polyphony operation.

Fixed bugs:

• [modules] strange behavior of the math/logical operators led output.
• [modules] fadein is applied sampler in MIDI mode.
• [usine VST] the MIDI In module doesn't work properly.