* Modifies fits table to add "mode" column, which contains typeID of mode for fit
* Introduces Mode type, similar to Ship and Module type
* Includes effects for Amarr Tactical Destroyer Propulsion Mode
Still a lot to do: GUI switching, constraints on which ships get modes, etc
This creates a new migration module that include upgrade logic files, one file for each DB version. It should be noted that this will not support downgrades (the previous method didn't really support them either)
