Save memory on FlyingF3

Before this we got free heap of 2604 bytes on default configuration.
After this we got free heap of 11992 bytes on the default configuration.
This means a gain of 9388 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!**