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/commands/search.lua

@@ -10,7 +10,10 @@ local format_player_name = Commands.format_player_name_locale
 local format_number = require("util").format_number
 
 --- A player who is of a lower role than the executing player
---- @type Commands.InputParser
+--- @param input string
+--- @param player LuaPlayer
+--- @return Commands.Status
+--- @return LuaItemPrototype | LocalisedString
 local function parse_item(input, player)
     -- First Case - internal name is given
     -- Second Case - rich text is given
@@ -146,7 +149,8 @@ Commands.new("search-online", { "exp-commands_search.description-online" })
     end)
 
 --- Return the amount of an item a player has
---- @type SortFunction
+--- @param data SearchResult
+--- @return number
 local function sort_by_count(data)
     return data.count
 end