Miscellaneous Bugfixes From My Multiplayer Branch

This is just a bunch of bugfixes I did while I was working on the Multiplayer Support PR. I know I should've kept them separate, but then I'd also be dealing with said bugs. So this PR adds most of the bugfixes I did while working on Multiplayer.

- De-globalized Pipe SFX from Pipe Cutscene (helps with lowering audio)
- De-globalized 1-up SFX for Players
- Removed an error log spam with the `ResourceSetter`s (involving connecting already connected signals)
- Made sure to insert "BaseAssets" folder into the FIRST slot in the Resource Packs array.
- Replaced `"BaseAssets"` for the above fix with `Godot.ROM_PACK_NAME`
- Removed unused `"character"` setting from `SettingsManager`
- Reset P-Switch timer when `Global.reset_values()` is called. Fixes bug when pressing a P-Switch and immediately restarting the level.
- Added Skid SFX to `AudioManager`
- Added slightly longer delay for when pausing with a controller (it can easily unpause before you press the button again)
- Null check if LevelBG is in the level or not (for added for test levels)

Scripts/Classes/Singletons/SettingsManager.gd

@@ -12,9 +12,9 @@ var file := {
 		"frame_limit" : 0,
 	},
 	"audio": {
-		"master": 10.0,
-		"music": 10.0,
-		"sfx": 10.0,
+		"master": 10,
+		"music": 10,
+		"sfx": 10,
 		"athletic_bgm": 1,
 		"extra_bgm": 1,
 		"skid_sfx": 1,
@@ -24,8 +24,7 @@ var file := {
 	},
 	"game": {
 		"campaign": "SMB1",
-		"lang": "en",
-		"character": "0000"
+		"lang": "en"
 	},
 	"keyboard":
 	{