[EXPORT][NUCLEO_F334R8] export to gcc_arm and coide

Exporter to gcc_arm and coide for target nucleo_f334r8. Previous pull request #527 had a merge conflict and @bogdanm asked to resubmit a new pull request.

- exporter to gcc_arm and coide
- rtos library is not working because of double defined SysTick_Handler in system_stm32f3xx.c and in rtos
- that's why the two new generated projects by export_test.py has to be changed manually (remove rtos library, change main e.g. to blinky example)
- please see pullrequest #526 for a correct export
- tests with "peripherals": ["digital_loop"] are going through:

Test summary:

+--------+---------------+-----------+-----------+---------------------------------------+--------------------+---------------+-------+
| Result | Target | Toolchain | Test ID | Test Description | Elapsed Time (sec) | Timeout (sec) | Loops |
+--------+---------------+-----------+-----------+---------------------------------------+--------------------+---------------+-------+
| OK | NUCLEO_F334R8 | GCC_ARM | DTCT_1 | Simple detect test | 0.44 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | EXAMPLE_1| /dev/null | 3.37 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_10 | Hello World | 0.37 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_11 | Ticker Int | 11.31 | 20 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_12 | C++ | 1.32 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_16 | RTC | 4.7 | 15 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_2 | stdio | 0.76 | 20 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_23 | Ticker Int us | 11.37 | 15 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_24 | Timeout Int us | 11.41 | 15 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_25 | Time us | 11.31 | 15 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_26 | Integer constant division|1.32| 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_A1 | Basic | 1.32 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_A21| Call function before main (mbed_main)|1.31|10|1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_A5 | DigitalIn DigitalOut | 1.31 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_A6 | DigitalInOut | 1.31 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_A7 | InterruptIn | 9.31 | 10 | 1/1 |
| OK | NUCLEO_F334R8 | GCC_ARM | MBED_A9 | Serial Echo at 115200 | 5.97 | 10 | 1/1 |
+--------+---------------+-----------+-----------+---------------------------------------+--------------------+---------------+-------+
Result: 17 OK

Completed in 125.02 sec