Closer to working PWM

Return to 16-bit stuff, no ISR, remove target/position difference,
Modulo mode, only channels 1 and 2 can do PWM (so only two PWMs; can't
switch timer locations).
Turret servos' speed limit.
Cleanup of HeaderDefs.h for twitch_mx_xbee
Removed ISR for timer1; Also dont need interrupts

Compiles. Switched back to 16bit math.
Disable unused variables; Compiles...
Untested fixes... Cleanup;

Realized I needed to switch the PWM pin from P1_2 to P1_1 (or P1_0)