readSector works() (now it reads bytes in row) only with an hard reset TCF flag, still need a timeout. need to fix TCF flag reset and backpropagate errors of QUADSPI utility methods.

API changed from std::vector to classic arrays, increased timeout value for sector_erase and page_program.

The pins for the usart1 and usart2 were inverted

Disallow the CPU from going to sleep in the idle thread as JTAG debuggers lose communication with the device if it enters sleep mode

Wrappers of
- `miosix::getTick()`
- `miosix::Thread::sleepUntil()`
- `miosix::Thread::IRQenableIrqAndTimedWaitMs`
have been created in the `Boardcore::Kernel` namespace.

In order to reduce the number of patches we make to the Miosix kernel, we're moving to calling Miosix USART IRQ handlers instead of accessing static port objects directly, which would require marking them for external linkage.
With this commit we are dropping support for USART ports higher than 3 when using the Miosix USART driver. For higher port counts, the boardcore driver must be used.