Menubar Lock and Model Reset

[cade9522]

Addressing Issues #69 and #70,

• Allows for user to reset model to initial configuration (position, scale, and rotation) in case of accidental manipulation without having to reload the model
• Locks the menubar options and disables the hover feature when importing a model or adding an antenna (to reduce annoyance mostly)
• Removes Export Object option (unused)
• Removes Snap button from object pane (unused)
• Changes an incorrect coordinate value in the F/A-18 txt file
• Modifies the help box to reflect new additions

[Proplex]

Looks great! Only concern is that once the antenna menu is selected, you cannot dismiss it unless you add an antenna. Would it be simple to check to see if the user clicks elsewhere and to hide the menubar when that happens?

Still, I approve. Overall function is great.