More updates to Unit converter

Force now completely valid unit
Refactored how names are retrieved from the unit converter
Added type names, in addition to their abreviations
Added "Show abbreviations" option to options menu.

Also, fixed spelling of "abbreviation"
shutup...
Added docs to unit converter
Added getters for various forces and numbers to flight physics

Which also now have proper conversions in place
Brought back the physics portion in the stats view

It now properly reads back physics information, although
this information may not be accurate.