Merge pull request #31 from MOARdV/master

Fix AGSTATE parsing.
Alexustas wanted this one.
Moving plans to issues.
Calculating propellant mass

As well as the preliminary primitive dV calculation.
Hm.
For consistency.

Closes #32
Merge pull request #41 from MOARdV/master

Added one more enhancement to JSISwitchableVariableLabel
Mechjeb variable provider!

Closes #37
Muahaha.
Oh, a link.
Initial import of example package data.

Binaries not included.
Pluggable actions.

Next step is to make those MJ buttons in ALCOR work...
Wait, state handler should be optional.

So that an action button that cannot normally return a state is
possible.
Oh, and persistence of state too.
Oh, and forgot about checks here...
Woot, it worked the first time.

Who'd have thought!
Closes #35
Missed a line.

Fixes #43
Corrections to defaults handling.
Smarter fallback.
Fix HUD failure to render when an invalid camera transform is supplied.