refactor: Refactor System imports and usage in PlayState.hx

Replaced direct references to openfl.system.System with System where possible, and adjusted import statements accordingly. Updated platformLabel usage to reference lime.system.System. This improves code clarity and ensures consistent usage of system-level functions.

Author: moxie-coder

source/PlayState.hx

@@ -4,8 +4,6 @@ import Achievements;
 import Character.Boyfriend;
 import Conductor.Rating;
 import DialogueBoxPsych;
-import Note.EventNote;
-import Note.PreloadedChartNote;
 import Note;
 import Section.SwagSection;
 import Shaders;
@@ -16,12 +14,11 @@ import editors.ChartingState;
 import flixel.input.keyboard.FlxKey;
 import flixel.ui.FlxBar;
 import flixel.util.FlxSort;
-import lime.system.System;
 import objects.*;
 import openfl.events.KeyboardEvent;
+import openfl.system.System;
 import play.objects.*;
 #if SHADERS_ALLOWED
-import openfl.filters.BitmapFilter;
 import openfl.filters.ShaderFilter;
 import shaders.ErrorHandledShader;
 #end
@@ -446,7 +443,7 @@ class PlayState extends MusicBeatState
 		inline Paths.clearStoredMemory();
 
 		#if sys
-		openfl.system.System.gc();
+		System.gc();
 		#end
 
 		// for lua
@@ -2744,7 +2741,7 @@ class PlayState extends MusicBeatState
 
 		final endTime = haxe.Timer.stamp();
 
-		openfl.system.System.gc();
+		System.gc();
 
 		final elapsedTime = endTime - startTime;
 
@@ -3249,7 +3246,7 @@ class PlayState extends MusicBeatState
 						PlayState.SONG = Song.loadFromJson(SONG.event7Value + (CoolUtil.difficultyString() == 'NORMAL' ? '' : '-' + CoolUtil.difficulties[storyDifficulty]), SONG.event7Value);
 				LoadingState.loadAndSwitchState(PlayState.new);
 				case "Close Game":
-					openfl.system.System.exit(0);
+					System.exit(0);
 				case "Play Video":
 					updateTime = false;
 					FlxG.sound.music.volume = 0;
@@ -3504,7 +3501,7 @@ class PlayState extends MusicBeatState
 					catch (e) {}
 				}
 			}
-			if (ClientPrefs.renderGCRate > 0 && (frameCaptured / targetFPS) % ClientPrefs.renderGCRate == 0) openfl.system.System.gc();
+			if (ClientPrefs.renderGCRate > 0 && (frameCaptured / targetFPS) % ClientPrefs.renderGCRate == 0) System.gc();
 			frameCaptured++;
 		}
 	}
@@ -4192,7 +4189,7 @@ class PlayState extends MusicBeatState
 				"Windows 7" => 7,
 			];
 
-			var platformLabel = System.platformLabel;
+			var platformLabel = lime.system.System.platformLabel;
 			var words = platformLabel.split(" ");
 			var windowsIndex = words.indexOf("Windows");
 			var result = "";