Add skill management system with unlocker and save functionality

resources/skills/brick_throw.tres

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+[gd_resource type="Resource" script_class="SkillData" load_steps=3 format=3 uid="uid://dw5ee2lpeypnb"]
+
+[ext_resource type="PackedScene" uid="uid://coayig4dxelo2" path="res://objects/player_skills/brick_throw_skill.tscn" id="1_5gnea"]
+[ext_resource type="Script" path="res://scripts/resources/skill_data.gd" id="1_etxe2"]
+
+[resource]
+script = ExtResource("1_etxe2")
+name = "Brick power"
+description = "Allows you to throw bricks at enemies"
+node = ExtResource("1_5gnea")
+config = {
+"player_controller": NodePath("."),
+"timer": NodePath("ThrowTimer")
+}
+cost = 50

resources/skills/magnetic.tres

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+[gd_resource type="Resource" script_class="SkillData" load_steps=3 format=3 uid="uid://d3bjre2etov1n"]
+
+[ext_resource type="PackedScene" uid="uid://cunyndudjh2he" path="res://objects/player_skills/magnetic_skill.tscn" id="1_er41s"]
+[ext_resource type="Script" path="res://scripts/resources/skill_data.gd" id="1_r01oq"]
+
+[resource]
+script = ExtResource("1_r01oq")
+name = "Magnetic"
+description = "Attract coins"
+node = ExtResource("1_er41s")
+config = {
+"magnetic_area": NodePath("MagneticArea"),
+"magnetic_move_duration": 1.25,
+"root": NodePath(".")
+}
+cost = 70