Add Conversion section

[jaghaimo]

A conditional board that only shows up when mod that offers ship conversion is enabled.

Board per mod: Offers a quick overview of ships from a given mod that can be created from other ships (and list of source ships for conversion).
One board for source ships: Offers a quick overview of ships that can be converted to other ships (and list of target ships that can be created from source ship).

All boards have intel buttons that enable a relevant small intel with details on all ships in a row (sources and targets alike).