Hand shared resources to the mods that use them

Findings of the resource atlas: engine and shell mods took these
resources from the content mod without depending on it.
- Main menu music (Serpent's Lament + the mainmenu playlist) -> base_menu.
- Battle win/defeat sounds -> turn_battle_base; UI sounds close_click and
  skip -> interface; card selection effect -> card_battle.
- Journal notification texts (ui/journal/new, updated) -> quests_base;
  settings screen texts (settings/*) -> base_menu.
- depends now declares characters_base, items_base and quests_base, whose
  resources the content uses.

music/playlists/mainmenu.json

@@ -1,11 +0,0 @@
-{
-  "Scene": "MainMenu",
-  "Musics": [
-    {
-      "MusicType": "Ambient",
-      "MusicNames": [
-        "Serpent's Lament"
-      ]
-    }
-  ]
-}