Independent trims for flight modes

[virtchan1]
template=complex
[mixer]
src=FMODE0
dest=Virt1
usetrim=0
curvetype=expo
points=0,0
[mixer]
src=AIL
dest=Virt1
switch=GEAR1
scalar=-100
usetrim=0
curvetype=fixed

[virtchan2]
template=complex
[mixer]
src=FMODE1
dest=Virt2
usetrim=0
curvetype=expo
points=0,0
[mixer]
src=AIL
dest=Virt2
switch=GEAR1
scalar=-100
usetrim=0
curvetype=fixed

[virtchan3]
template=complex
[mixer]
src=FMODE2
dest=Virt3
usetrim=0
curvetype=expo
points=0,0
[mixer]
src=AIL
dest=Virt3
switch=GEAR1
scalar=-100
usetrim=0
curvetype=fixed

[virtchan4]
template=complex
[mixer]
src=FMODE2
dest=Virt4
usetrim=0
curvetype=expo
points=0,0
[mixer]
src=AIL
dest=Virt4
switch=GEAR0
scalar=-100
usetrim=0
curvetype=fixed

[virtchan5]
template=complex
[mixer]
src=FMODE0
dest=Virt5
usetrim=0
curvetype=expo
points=0,0
[mixer]
src=AIL
dest=Virt5
switch=GEAR0
scalar=-100
usetrim=0
curvetype=fixed

[virtchan6]
template=complex
[mixer]
src=FMODE1
dest=Virt6
usetrim=0
curvetype=expo
points=0,0
[mixer]
src=AIL
dest=Virt6
switch=GEAR0
scalar=-100
usetrim=0
curvetype=fixed

[trim1]
src=LEFT_V
pos=TRIMLV+
neg=TRIMLV-
switch=Virt1
value=-1,-12,-26,-38,-52,-64
[trim2]
src=RIGHT_V
pos=TRIMRV+
neg=TRIMRV-
switch=Virt1
value=-1,-12,-26,-38,-52,-64
[trim3]
src=LEFT_H
pos=TRIMLH+
neg=TRIMLH-
switch=Virt1
value=-1,-11,-23,-39,-53,-64
[trim4]
src=RIGHT_H
pos=TRIMRH+
neg=TRIMRH-
switch=Virt1
value=-1,-11,-25,-39,-52,-65

Add support for 6 independent trims set #347

You can use 4-6 contiguous virtual channels to setup 4-6 pos switch, then assign to trims "Switch" the first used virtual channel and 
you will have 4-6 independent trims set. The virtual channels switch at any state should have only single channel with +100% value, 
all others -100%. It's intended for for 4-6 flight modes with independent trims settings.

s8 *MIXER_GetTrim(unsigned i)
{
    if (Model.trims[i].sw) {
        int num_positions = INPUT_NumSwitchPos(Model.trims[i].sw);
        if (num_positions != 0) {
            for (int j = 0; j < num_positions; j++) {
                // Assume switch 0/1/2 are in order
                if(raw[Model.trims[i].sw + j] > 0) {
                    return &Model.trims[i].value[j];
                }
            }
        } else {
            for (int j = 0; j < 6; j++) {
                // Assume channel switch step is 3333
                if((raw[Model.trims[i].sw] > CHAN_MIN_VALUE + 1 + j * 3333) && 
                   (raw[Model.trims[i].sw] <= CHAN_MIN_VALUE + 1 + (j + 1) * 3333)) {
                    return &Model.trims[i].value[j];
                }
            }
        }
    }
    return &Model.trims[i].value[0];
}