[velbus] New functionality & Bug fix

New functionality :

• Add modules : VMB2DC-20, VMBGPTC, VMB4RYLD-20, VMB4RYNO-20, VMBPSUMNGR-20, VMBPIRO-20, VMBSIG, VMBSIG-20, VMBSIG-21.
• Implementation update for VMBPIRO-10: Use PIRO implementation.
• Implementation update for VMB4LEDPWM_20: Support for the 3 modes (4x dimmer, RGB + 1x dimmer, RGBW) -> Add properties: "mode" and channels: "VL1, DW1"

Bug fix :

• There was a conflict when the system was restarted and Alarm values were restored from OpenHAB. The Global value (when configured) was overwritten by the Local default value of the module.
  The default value for the Alarms (Global & Local) are now:
  Wake 1: 00:00 (before 07:00)
  Bed 1: 00:00 (before 23:00)
  Wake 2: 00:00 (before 07:00)
  Bed 2: 00:00 (before 23:00)
  Now, when the values are restored after a restart, if the restored times are all 00:00, the Alarm values are not sent on the bus.

Update ReadMe.

[velbus] New functionality & Bug fix

New functionality :

• Add OnOff command type on Brightness channels for VMB4LEDPWM-20. Sending an ON command will switch the dimmer to the value stored when last turning the dimmer off.

Fix bug :

• VMB8IN-20 implementation rewrite.