Moved the 'types.h' file to the drivers directory.

This file was not specific to the actual application but rather to the
whole project including tests.
Code refactoring: adapted variable names to the code convention.

Some variables (timers) were still named using the CamelCase convention.
Modified the names of the RXSM signals.

Prepended them with RXSM_ for clarity.
IDE configuration files.
Added status bits (LO, SODS, SOE) for downlink.

Fixed various bugs (timer variable sizes, CRC computation).