Inverter Status addition

Proposed by Martin Perlot, SilverLeaf Electronics.

Add to INVERTER_STATUS, Byte 1, STATUS, a sixth option, "Waiting to Invert"

0 - Disabled
1 - Invert
2 - AC passthru
3 - APS Only
4 - Load sense (Unit is waiting for a load.)
5 - Waiting to Invert

Some inverters experience a significant delay between being enabled and actually producing power. During the gap between status 0 (Disabled) and 1 (Invert), the unit should report 5 (Waiting).