Implement input locking for the windows.
Set defaults for timed builds and forced resource usage.

People have often been confused by things, and having inappropriate
defaults never helped, so now they both default to on. However, once they
are set, the default will be remembered for the remainder of the KSP
session (restarting KSP will reset the defaults to on).
Remove the KSPField attribute from lastUpdate.

It's not necessary, and I think the comment wasn't needed either.
Merge branch 'henrybauer-master'

Closes #81.
Plug some NRE holes when Toolbar is not installed.
Some fixes for KSP 0.90.
Fix settings loading.

Why doesn't GetConfigNode work?