Refactor of cstimer.h, renamed all the files that use its functions

...32gg/efm32gg332f1024_wandstem/interfaces-impl/cstimer.cpp

...g/efm32gg332f1024_wandstem/interfaces-impl/gpio_timer.cpp

...4_wandstem/interfaces-impl/high_resolution_timer_base.cpp

...024_wandstem/interfaces-impl/high_resolution_timer_base.h

.../efm32gg332f1024_wandstem/interfaces-impl/radio_timer.cpp

...ix/arch/cortexM3_stm32/common/interfaces-impl/cstimer.cpp

.../arch/cortexM4_stm32f4/common/interfaces-impl/cstimer.cpp

miosix/interfaces/cstimer.h

miosix/kernel/kernel.cpp

miosix/kernel/scheduler/control/control_scheduler.cpp

miosix/kernel/scheduler/priority/priority_scheduler.cpp