[STM32xxx] CoIDE exporter and gcc_arm ...

- CoIDE options: wrap main and linker option DiscradUnusedSection=1 was
missing in some targets
- CoIDE options: corrected flash loader config for Nucleo_F030 and
Nucleo_F072
- CoIDE options: corrected memory layout (not used per default but now
it is the same as in linker script)
- gcc linker script: changed the memory size from hex number e.g. 0x2000
to decimal 8K

[EXPORT][NUCLEO_F334R8] export to gcc_arm and coide ...

- rtos library is not working because of double defined SysTick_Handler
in system_stm32f3xx.c and in rtos
- please see pullrequest #526 for a correct export
- tests are working fine:
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