Fix AP++ autopilot disconnect sound

Server hosting MP3 file is down, moved to Dropbox temporarily
Start work on 0.4.3

Mainly fixes to GEFS PID implementation
Start revamp of PID implementation/usage

Because the GEFS PID controller is actually incorrectly implemented,
start work on redoing it and also stop making the results dependent on
arbitrary speed ratio which makes it difficult to set limits on PID
controller.
Minor preparations/reorganisation/cleaning

Prepare for Greasemonkey support, clean up folder structure, named
folder, move binary zip files out of folder (yet to think of structure
to move .crx files), clean up unnecessary folders.
Update README to add link to Github & license

Make sure link to GNU GPLv3 and Github source code is there, to comply
with license requirements.
Initial dev commit

Branched off into a dev branch to reduce confusion and people using
breaking changes before release
Added Greasemonkey support to build scripts

Also removed Chrome and Greasemonkey folders - changed layout of folders
to better suit actual release method
Change files to LF endings

Added .gitattributes file and manually changed line endings to LF
instead of CRLF
Start work on 0.5

Improved autopilot PID work, still to complete. Since it's a feature enhancement, I've moved work from v0.4.3 to v0.5 instead.
More work on 0.5
Changed source for airports, refactoring

Just found out that original data was breaching GPL license rules, so I
have removed it. Also refactored and improved the PID function, still
needs more work though.
Separate plugins into different repositories

Autopilot++ will remain in this repository (albeit renamed) and a fork
of this repository will be made for the new Nose Wheel Steering Plugin
repository I'm going to make.
Changed indenting to 3 point
Update Autopilot++ to v0.5.0

Significant improvements to the PID control, reworking of numerous parts
of the plugin plus an updated ICAO airports database.