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.

player_row.gd

@@ -2,19 +2,19 @@ class_name PlayerRow
 extends Control
 
 @onready
-var player_name_field := $HBoxContainer/Name
+var player_name_field: Label = %Name
 
 @onready
-var add_button := $HBoxContainer/AddPoint
+var add_button: Button = %AddPoint
 
 @onready
-var minus_button := $HBoxContainer/RemovePoint
+var minus_button: Button = %RemovePoint
 
 @onready
-var character := $HBoxContainer/Character
+var character: TextureButton = %Character
 
 @onready
-var remove_player := $HBoxContainer/RemovePlayer
+var remove_player: TextureButton = %RemovePlayer
 
 signal change_character_clicked
 signal player_removed