Reach nodes by unique name instead of long paths

Nodes a script uses through a path of several nodes are marked unique in their
scene and found with %Name. The search list is renamed SearchResults, and the
player row's nodes get their real types.

music_player.gd

@@ -7,10 +7,10 @@ extends Control
 # LOC 12/6-24: 170
 
 @onready
-var play_button: TextureButton = $PlayerBar/MusicPlayerContainer/PlayTextureButton
+var play_button: TextureButton = %PlayTextureButton
 
 @onready
-var restart_button: TextureButton = $PlayerBar/MusicPlayerContainer/RestartTextureButton
+var restart_button: TextureButton = %RestartTextureButton
 
 @onready
 var audio_player: AudioStreamPlayer = $AudioStreamPlayer
@@ -22,13 +22,13 @@ var sound_player: AudioStreamPlayer = $AudioSoundPlayer
 var sound_effect_player: AudioStreamPlayer = $AudioSoundEffectPlayer
 
 @onready
-var progress_slider: HSlider = $PlayerBar/MusicPlayerContainer/MusicPlayerSlider
+var progress_slider: HSlider = %MusicPlayerSlider
 
 @onready
-var volume_slider: VolumeSlider = $PlayerBar/MusicPlayerContainer/VolumeSlider
+var volume_slider: VolumeSlider = %VolumeSlider
 
 @onready
-var music_time_label: Label = $PlayerBar/MusicPlayerContainer/MusicTimeLabel
+var music_time_label: Label = %MusicTimeLabel
 
 @onready
 var auto_repeat_button: CheckButton = $RepeatSongCheckButton