Save memory on FlyingF3

Before this we got free heap of 2604 bytes on default configuration.
After this we got free heap of 10968 bytes on the default configuration.
This means a gain of 8364 bytes.
This is meant to address #269.
Note: I had to fix some severe formatting problems within the linker scripts. It should be easiest to review single commits.

**WARNING: This requires a bootloader update!**