[STM32F3xx] linker script reorganisation
[STM32L053xx] linker script reorganisation
[STM32F03X][STM3207X] linker script reorganizatin
[DISCO_F4xx][NUCLEO_F4xx] linker and startup script reorganisation
[STM32L1xx] linker script reorganisation
[STM_Targets] linker file naming principle
Merge pull request #743 from ohagendorf/linker_scripts

Targets: STM32F0, F3, F4, L053, L152 -  GCC ARM linker script reorganisation