Support for NRPN CCs

[tomoinn]

A few of the existing mappings are wrong because they're attempting to model NRPN rather than seven bit CC values (Elektron devices in particular). It'd be nice to support this properly, probably by making CC value able to be a two element list or integer as is currently the case.

[tomoinn]

For example, this is the output from my code when attempting to merge CCs on the Digitone:

Cannot merge CCs with inconsistent naming conventions [CC(value=24, name='Filter: Resonance', min=0, max=127, description=''), CC(value=24, name='Input L Volume', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=25, name='Filter: Env. Depth', min=0, max=127, description=''), CC(value=25, name='Input R Volume', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=26, name='Filter: Base', min=0, max=127, description=''), CC(value=26, name='Chorus Send', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=27, name='Filter: Width', min=0, max=127, description=''), CC(value=27, name='Delay Send', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=28, name='LFO: Speed LFO1', min=0, max=127, description=''), CC(value=28, name='Reverb Send', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=29, name='LFO: Depth LFO1', min=0, max=127, description=''), CC(value=29, name='Master Overdrive', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=70, name='Filter: Attack Time', min=0, max=127, description=''), CC(value=70, name='CC VAL1', min=0, max=127, description=''), CC(value=70, name='Chorus: Highpass', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=71, name='Filter: Decay Time', min=0, max=127, description=''), CC(value=71, name='CC VAL2', min=0, max=127, description=''), CC(value=71, name='Chorus: Width', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=72, name='Filter: Sustain Level', min=0, max=127, description=''), CC(value=72, name='CC VAL3', min=0, max=127, description=''), CC(value=72, name='Delay: Highpass Filter', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=73, name='Filter: Release Time', min=0, max=127, description=''), CC(value=73, name='CC VAL4', min=0, max=127, description=''), CC(value=73, name='Delay: Lowpass Filter', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=74, name='Filter: Type', min=0, max=127, description=''), CC(value=74, name='CC VAL5', min=0, max=127, description=''), CC(value=74, name='Reverb: Decay Time', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=75, name='SYN2: A ENV Attack', min=0, max=127, description=''), CC(value=75, name='CC VAL6', min=0, max=127, description=''), CC(value=75, name='Reverb: Shelving Freq', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=76, name='SYN2: A ENV Decay', min=0, max=127, description=''), CC(value=76, name='CC VAL7', min=0, max=127, description=''), CC(value=76, name='Reverb: Highpass Filter', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=77, name='SYN2: A ENV End', min=0, max=127, description=''), CC(value=77, name='CC VAL8', min=0, max=127, description=''), CC(value=77, name='Reverb: Lowpass Filter', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=78, name='SYN2: A ENV Level', min=0, max=127, description=''), CC(value=78, name='Pan L', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=79, name='SYN2: B ENV Attack', min=0, max=127, description=''), CC(value=79, name='Pan R', min=0, max=127, description='')]
Cannot merge CCs with inconsistent naming conventions [CC(value=95, name='Track Level', min=0, max=127, description=''), CC(value=95, name='Pattern Volume', min=0, max=127, description='')]

Looking at the manual this is because these are not regular CCs, this cannot ever have worked without NRPN support