Bug with Piqued's "Gate High" parameter

[w-winter]

There are a couple of issues with Piqued's "Gate High" parameter:

(1) The little "gate icon" next to the A/B/C/D channel marker doesn't switch on when you select "Gate High : "Yes". What I've found fixes this is changing https://github.com/mxmxmx/O_C/blob/master/software/o_c_REV/APP_ENVGEN.ino#L570 to read gate_raised_ = gate_raised || get_gate_high();

(2) State changes from "No" to "Yes" only appears to be respected when you switch the channel type (which probably forces all the menu options to be reread), so it's only possible to make one of the looping envelope types (e.g., ADL2) loop using "Gate High" after switching the envelope type.