New led status

HOTFIX: simplify symbol names going into the ROMFS object, hopefully this avoids inconsistent symbol naming on Windows.

Change the way modules are built so that object paths are relative and use vpath for locating sources (so source paths are also shorter).

Add some basic documentation for the build system files while we're at it.

Marko Pagott <p0rc0.jet@gmail.com>

Quad wide arm mixer

MD25 Motor Controller Driver

Hil press fix

Velocity based gain adjustment based on dynamic presssure

Update servo arm only on real change.