Added icons, a lot of refactoring and optimising

MusicPlayer.tscn

@@ -0,0 +1,59 @@
+[gd_scene load_steps=6 format=3 uid="uid://ds15cgsf8vpvc"]
+
+[ext_resource type="Script" path="res://MusicPlayer.gd" id="1_t24ra"]
+[ext_resource type="AudioStream" uid="uid://n2g8jddr85h2" path="res://01. Opening.mp3" id="2_xti80"]
+[ext_resource type="Texture2D" uid="uid://balbkfmupmj8u" path="res://icons/play_icon.svg" id="3_2ym83"]
+[ext_resource type="Texture2D" uid="uid://cu5d30apj6os6" path="res://icons/134221_refresh_reload_repeat_update_arrow_icon.svg" id="4_1grnq"]
+[ext_resource type="PackedScene" uid="uid://w400rnew7453" path="res://volume_slider.tscn" id="5_iifuj"]
+
+[node name="MusicPlayer" type="PanelContainer"]
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -121.0
+offset_top = -15.5
+offset_right = 121.0
+offset_bottom = 16.5
+grow_horizontal = 2
+grow_vertical = 2
+size_flags_vertical = 4
+script = ExtResource("1_t24ra")
+
+[node name="AudioStreamPlayer" type="AudioStreamPlayer" parent="."]
+stream = ExtResource("2_xti80")
+
+[node name="MusicPlayerContainer" type="HBoxContainer" parent="."]
+layout_mode = 2
+size_flags_vertical = 4
+
+[node name="PlayTextureButton" type="TextureButton" parent="MusicPlayerContainer"]
+custom_minimum_size = Vector2(32, 32)
+layout_mode = 2
+texture_normal = ExtResource("3_2ym83")
+ignore_texture_size = true
+stretch_mode = 0
+
+[node name="RestartTextureButton" type="TextureButton" parent="MusicPlayerContainer"]
+custom_minimum_size = Vector2(32, 32)
+layout_mode = 2
+texture_normal = ExtResource("4_1grnq")
+ignore_texture_size = true
+stretch_mode = 0
+flip_h = true
+
+[node name="MusicPlayerSlider" type="HSlider" parent="MusicPlayerContainer"]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 4
+scrollable = false
+
+[node name="MusicTimeLabel" type="Label" parent="MusicPlayerContainer"]
+layout_mode = 2
+text = "1:00 / 3:00"
+
+[node name="VolumeSlider" parent="MusicPlayerContainer" instance=ExtResource("5_iifuj")]
+custom_minimum_size = Vector2(100, 0)
+layout_mode = 2
+size_flags_vertical = 4