ivory-bsp-stm32: rename all STM32F4 modules to STM32F405
ivory-bsp-stm32: remove rcc specific class, gpiof4 peripheral is now separate/generic
ivory-bsp-stm32: flash moved to generic stm32 module
ivory-bsp-stm32: move i2c files from f405 to stm32
ivory-bsp-stm32: start adding platform class
ivory-bsp-stm32: factored out signalable/interrupts into stm32-wide type family

- TH instance creator is still broken