Add asciicast importer

Former-commit-id: ffa8561865

addons/godot_xterm/resources/asciicast.gd

@@ -0,0 +1,19 @@
+extends Animation
+
+
+signal data_written(data)
+signal data_read(data)
+
+export(int) var version: int = 2
+# Initial terminal width (number of columns).
+export(int) var width: int
+# Initial terminal height (number of rows).
+export(int) var height: int
+
+
+func get_class() -> String:
+	return "Asciicast"
+
+
+func is_class(name) -> bool:
+	return name == get_class() or .is_class(name)