Remove the build-generated files from git.
Rename EnableBuildMenu and DisableBuildMenu.

They have been changed to ShowBuildMenu and HideBuildMenu to match the
event names. This fixes not only the null reference exceptions when in the
vicinity of a pad, but also the updating of the build menu button in the
context menu.
Merge pull request #33 from taniwha-qf/gui-control

Gui control