[stm32] ppm: renamed USE_TIMx_IRQ to USE_PPM_TIMx and add a list with used TIMs
[subsystems/electrical] fix conversion of vsupply to decivolts
* Should now work correctly with <define name="VoltageOfAdc(adc)" value ="(VOLTAGE_ADC_A * adc + VOLTAGE_ADC_B )"/> with VOLTAGE_ADC_B in Volts
* Also fix VoltageOfAdc to DefaultVoltageOfAdc in board header for tiny_2.0
[subsystems/electrical] fix missing bracket
[stm32][adc] automatically use TIM1 for ADC if TIM2 is already used by RC ppm input on SERVO6
fixes #339
[stm32] fix renaming of USE_TIMx_IRQ to USE_PPM_TIMx
comment on why USE_AD_TIM1 is needed for PPM with input pin on servo6