Encoder support for both edges

[Mike Purvis]

stm32plus currently supports only rising or falling edge:

stm32plus/lib/include/timer/features/TimerEncoderFeature.h

Lines 28 to 31 in 20d12f9

 enum class EncoderPolarity { 
   Rising,           ///! Rising edge transition 
   Falling           ///! Falling edge transition 
 }; 

But the underlying fwlib has an option for TIM_ICPolarity_BothEdge:

stm32plus/lib/fwlib/f4/stdperiph/inc/stm32f4xx_tim.h

Lines 507 to 509 in 20d12f9

 #define  TIM_ICPolarity_Rising             ((uint16_t)0x0000) 
 #define  TIM_ICPolarity_Falling            ((uint16_t)0x0002) 
 #define  TIM_ICPolarity_BothEdge           ((uint16_t)0x000A) 

[Mike Purvis]

Woot, thanks!