Uniformize dock trainable entities

Docks are generic and have all ship entities. This comes to play notably when
they are captured. This is currently not the case for special docks (Crannog and
Cothon). For consistency they are given ship entities that are trainable by
other civilizations.

Also, the Crannog was not updated with the naval overhaul and still had the
trireme and bireme entities. They are now removed.

Fixes #7426

binaries/data/mods/public/maps/scenarios/pickup_test_map_triggers.js

@@ -1,5 +1,5 @@
 const UNIT_TEMPLATE = "units/athen/infantry_marine_archer_b";
-const SHIP_TEMPLATE = "units/athen/ship_trireme";
+const SHIP_TEMPLATE = "units/athen/ship_arrow";
 const RAM_TEMPLATE = "units/brit/siege_ram";
 
 const point_plaza_nw = 14; // Center plaza #1 (NW)

binaries/data/mods/public/simulation/templates/structures/brit/crannog.xml

@@ -43,8 +43,11 @@
       units/{civ}/cavalry_javelineer_b
       units/{civ}/ship_fishing
       units/{civ}/ship_merchant
-      units/{civ}/ship_bireme
-      units/{civ}/ship_trireme
+      units/{civ}/ship_scout
+      units/{civ}/ship_arrow
+      units/{civ}/ship_ram
+      units/{civ}/ship_fire
+      units/{civ}/ship_siege
     </Entities>
   </Trainer>
   <VisualActor>

binaries/data/mods/public/simulation/templates/structures/cart/super_dock.xml

@@ -97,6 +97,7 @@
       units/{civ}/ship_scout
       units/{civ}/ship_arrow
       units/{civ}/ship_ram
+      units/{civ}/ship_fire
       units/{civ}/ship_siege
     </Entities>
   </Trainer>