Converts Ship_info from a ship_info[] to an SCP_vector<ship_info>. ship_info now has proper constructors, assignment operators, and a destructor. Num_ship_classes removed; various references to Num_ship_classes and/or MAX_SHIP_CLASSES (which remains for various other structures which need it) changed to Ship_info.size() instead.
This doesn't make the ship class limit dynamic, but it is a preparatory step to get there.
Adds ON_CLBN_CHKCHANGE to the message map for the ships and weapons lists so that hitting spacebar to change the checked/unchecked status of a ship or weapon also updates the availability count.
git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11295 387891d4-d844-0410-90c0-e4c51a9137d3
Get-Damage-Caused SEXP and a couple of functions for counting the number of variables of a certain type.
Commit the new team loadout code and FRED changes to support it.
MageKing17