Fix duplicate class and annotation placement lint errors

Classes contributed to by more than one file now carry the `partial`
attribute. trains.lua declared its command as `ExpCommand_Artillery`,
which was a copy paste.

`Color.0` and `MapPosition.0` became `.struct` in fmtk 2.1.6.

emmylua rejects `@type` on a function statement or a `do` block, so
those are moved onto the local or replaced by `@param` and `@return`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

exp_scenario/module/gui/player_bonus.lua

@@ -47,8 +47,7 @@ Elements.bonus_used = Gui.define("player_bonus/bonus_used")
     :element_data(0) --[[ @as any ]]
 
 --- Value is cached to save perf
---- @type table<number, number>
-do local _points_limit = {}
+do local _points_limit = {} --- @type table<number, number>
     --- Clear the cache for points limit
     --- @param player LuaPlayer
     function Elements.bonus_used._clear_points_limit_cache(player)