Add rules for asm source generation.
Refactor for ITimer args changes.
Add tests for StaticDelay (for ARM so far only).
Add StaticDelay for Cortex-M.

Untested for perfect-cycledness.
Use delay_static_cortexm for all Cortex-M devices.
Removed dummy delay static for stm32 & efm32.
Add dynamic delay implementation for Cortex-M.