LaunchDevice Filter and Other Stuff

Added four optional new info fields to instances: LaunchWidth, LaunchLength, MaxMass, LaunchDevice

LaunchDevice is used with a new filter in the launch selector.

In the instance:
LaunchWidth: X in meters. The m will be added in the selector.
LaunchLength: X in meters. The m will be added in the selector.
MaxMass: X in tons. The t will be added in the selector. This is a recommendation and not enforced.

These default to ?. They're strings, not integers, so feel free to abuse them.

LaunchDevice = option

LaunchDevice options are:
RocketPad
Runway
Helipad
Other

Defaults to Other.

No quotation marks.

Added some stubs and commentary for future features. So that means a button that does not do anything yet in the launch selector.
Changed the layout of the launch selector and editor a bit, for usability. Personal taste stuff - medsouz axe this if you hate it.