Add Music Extension to grammar

[quachtina96]

For the audio-only context, the music extension blocks could also be powerful and fun!

[karaluo09]

Tempo commands:

• [x] Set the tempo to NP

• [x] Set tempo to NP

• [x] Change the tempo by NP

• [x] Increase the tempo by NP

• [x] Decrease the tempo by NP

Instrument commands:

• [x] Use the INSTRUMENT

• [x] Set the instrument to INSTRUMENT

• [x] Use INSTRUMENT as the instrument

• [x] Play the INSTRUMENT

Notes:

• [x] Play the NOTE note for NP beats

Drums:

• [x] Play [the] INSTRUMENT [for] NP beats

• [x] Play [the] INSTRUMENT drum/instrument [for] NP beats

• [x] Play [drum] INSTRUMENT [for] NP beats

[karaluo09]

Could not parse floats from speech -resolved-

[quachtina96]

Play the NOTE note for NP beats currently expects NOTE to be a number... but can we actually use something more intuitive? like A or C?