Add "Business Aviation" stand type

[cbyworth]

Pretty much what it says on the tin.
Similar to 'Cargo' add a 'Business Aviation' stand type, would allow for stand allocation for business jets.
Would need a list of common business aviation aircraft types - I'll come back with a suggested list.

[hazzas-99]

See thread: https://discord.com/channels/705488311346790471/1362465626387382433