CIP-1898 fix FSP and VCC attributes
Fix the following FSP and VCC attributes:
- FSP: subarrayMembership value persists after subarray GoToIdle; subarray now removes FSP subarrayMembership during GoToIdle
- FSP: functionMode not pushing change events; tested subscribe with python script and this attribute seems to be pushing events
- VCC: frequencyBand not pushing change events; tested subscribe with python script and this attribute seems to be pushing events
Additionally, fixed a bug where FSP was always assigning every function mode subarray device to its group proxies; now it adds/removes them based on subarray membership
Edited by Taylor Huang