replace ai, photo_mode and radio museums with gyms

docs/gyms/radio/gym_radio.gd

@@ -0,0 +1,35 @@
+extends Node3D
+
+@onready var radio: Radio = $%Radio
+@onready var button_pause_resume: Button = $%Button_Pause_Resume
+@onready var settings_menu: SettingsMenu = $%SettingsMenu
+
+func _on_button_play_pressed() -> void:
+	if !radio.playing:
+		radio.play_track()
+
+
+func _on_button_pause_pressed() -> void:
+	radio.toggle_pause()
+	if !button_pause_resume:
+		button_pause_resume = $%Button_Pause_Resume
+	if radio.stream_paused:
+		button_pause_resume.text = "Resume"
+	else:
+		button_pause_resume.text = "Pause"
+
+
+func _on_button_stop_pressed() -> void:
+	radio.stop_radio()
+
+
+func _on_button_next_pressed() -> void:
+	radio.next_track()
+
+
+func _on_button_previous_pressed() -> void:
+	radio.prev_track()
+
+
+func _on_button_settings_menu_pressed() -> void:
+	settings_menu.visible = !settings_menu.visible