Mod naming rule and engine UI in engine mods

Mods are renamed by role (shell2d_base, menu_base, ui_base, live2d_base,
editor_tools, cthangover_story, cthangover_murakami, cthangover_party) and
every reference follows. Engine UI prefabs (dialog, answers, message, game
menu, inventory, map, skills) and their panel entries moved out of the story
mod into the subsystem mods; the card_novel and vn_starter_novel collections
are removed.

locale/en.properties

@@ -1,5 +1,5 @@
-mod_visual_novel_core_name = Visual Novel Core
-mod_visual_novel_core_desc = Base content mod: scenarios, characters, items, quests and the dialog layer of the visual novel on top of the 2D platform.
+mod_cthangover_story_name = Cthangover: Story
+mod_cthangover_story_desc = Story content of the Cthangover game: scenes, scenarios, characters, items, quests, backgrounds and the main game collection.
 
 prolog/title = * A few missed moments earlier *
 prolog/line1 = Being thoroughly wasted, Marao lay peacefully in the alley.
@@ -74,9 +74,3 @@ mapzone/town_entry = Town entrance
 mapzone/town_entry/info = The northern entrance to the town
 
 # Collections (vn_starter_novel)
-collections/vn_starter_novel/name = Card Novel
-collections/vn_starter_novel/description = A visual novel with an optional card-battle layer.
-collections/vn_starter_novel/mechanic/vn_core/name = Novel
-collections/vn_starter_novel/mechanic/vn_core/description = Scenes, scenarios, dialogue and the story engine.
-collections/vn_starter_novel/mechanic/cards/name = Card Battle
-collections/vn_starter_novel/mechanic/cards/description = Card-driven battles on top of the turn-based engine.