New ARM version.

Today I introduce a new ARM version of MegaDrum.
It will now be based on STM32F205RCT6 chip. Compared to the older STM32F103RCT6 version, it is running at higher clock frequency - 120MHz vs 72MHz. Faster speed will allow to reduce internal latency a bit more.
It will now be based on STM32F205RCT6 chip. Compared to the older STM32F103RCT6 version, it is running at higher clock frequency - 120MHz vs 72MHz. Faster speed will allow to reduce internal latency a bit more.