Preliminary backend support for tactical destroyer modes.

* 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

eos/effects/modeagilitypostdiv.py

@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    # @todo: most likely have to fix this on release
+    fit.ship.boostItemAttr("agility", module.getModifiedItemAttr("modeAgilityPostDiv"),
+                           stackingPenalties = True, penaltyGroup="postDiv")

eos/effects/modevelocitypostdiv.py

@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    # @todo: most likely have to fix this on release
+    fit.ship.boostItemAttr("maxVelocity", module.getModifiedItemAttr("modeVelocityPostDiv"),
+                           stackingPenalties = True, penaltyGroup="postDiv")