Close all open editors when running a terminal command

This is a first workaround for the problem that editors are sometimes
out of date. The UI around these will probably continue to change
significantly. Closes #7.

scenes/file_browser.tscn

@@ -4,7 +4,9 @@
 [ext_resource path="res://fonts/default.tres" type="DynamicFont" id=2]
 [ext_resource path="res://styles/theme.tres" type="Theme" id=3]
 
-[node name="FileBrowser" type="Control"]
+[node name="FileBrowser" type="Control" groups=[
+"editors",
+]]
 anchor_right = 1.0
 anchor_bottom = 1.0
 rect_min_size = Vector2( 0, 142 )

scenes/terminal.gd

@@ -72,6 +72,7 @@ func load_command(id):
 	input.caret_position = input.text.length()
 
 func send_command(command):
+	close_all_editors()
 	game.state["history"].push_back(command)
 	game.save_state()
 	history_position = game.state["history"].size()
@@ -206,3 +207,7 @@ func _completion_selected():
 
 func editor_saved():
 	emit_signal("command_done")
+
+func close_all_editors():
+	for editor in get_tree().get_nodes_in_group("editors"):
+		editor.close()

scenes/text_editor.tscn

@@ -3,7 +3,9 @@
 [ext_resource path="res://fonts/default.tres" type="DynamicFont" id=1]
 [ext_resource path="res://scenes/text_editor.gd" type="Script" id=2]
 
-[node name="TextEditor" type="TextEdit"]
+[node name="TextEditor" type="TextEdit" groups=[
+"editors",
+]]
 anchor_right = 1.0
 anchor_bottom = 1.0
 custom_colors/background_color = Color( 0, 0, 0, 1 )