core: keep tank infos in a dynamic table

The list of known tank types were kept in a fixed size table.
Instead, use a dynamic table with our horrendous table macros.
This is more flexible and sensible.

While doing this, clean up the TankInfoModel, which was leaking
memory.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

subsurface-desktop-main.cpp

@@ -77,6 +77,7 @@ int main(int argc, char **argv)
 	setup_system_prefs();
 	copy_prefs(&default_prefs, &prefs);
 	fill_computer_list();
+	reset_tank_info_table(&tank_info_table);
 	parse_xml_init();
 	taglist_init_global();
 	init_ui();