Update license text in file headers

With the exception of text_decoder.gd the code in these files follows
the original so closely that it doesn't qualify as an original work
and so there is nothing new to copyright.

Instead, the original license text is kept with a note mentioning the
port to GDScript.

addons/godot_xterm/input/text_decoder.gd

@@ -1,4 +1,4 @@
-# Copyright (c) 2020 The GodotTerm authors.
+# Copyright (c) 2020 The GodotXterm authors.
 # Copyright (c) 2019 The xterm.js authors. All rights reserved.
 # License MIT
 extends Reference

addons/godot_xterm/parser/constants.gd

@@ -1,5 +1,5 @@
-# Copyright (c) 2020 The GodotXterm authors.
 # Copyright (c) 2019 The xterm.js authors. All rights reserved.
+# Ported to GDScript by the GodotXterm authors.
 # License MIT
 extends Reference
 

addons/godot_xterm/parser/dcs_parser.gd

@@ -1,5 +1,5 @@
-# Copyright (c) 2020 The GodotXterm authors.
 # Copyright (c) 2019 The xterm.js authors. All rights reserved.
+# Ported to GDScript by the GodotXterm authors.
 # License MIT
 extends Reference
 

addons/godot_xterm/parser/escape_sequence_parser.gd

@@ -1,5 +1,5 @@
-# Copyright (c) 2020 The GodotXterm authors. All rights reserved.
 # Copyright (c) 2018 The xterm.js authers. All rights reserved.
+# Ported to GDScript by the GodotXterm authors.
 # License MIT
 extends Reference
 

addons/godot_xterm/parser/params.gd

@@ -1,5 +1,5 @@
-# Copyright (c) 2020 The GodotTerm authors.
 # Copyright (c) 2019 The xterm.js authors. All rights reserved.
+# Ported to GDScript by the GodotXterm authors.
 # License MIT
 extends Reference
 

addons/godot_xterm/parser/vt500_transition_table.gd

@@ -1,5 +1,5 @@
-# Copyright (c) 2020 The GodotXterm authors.
 # Copyright (c) 2019 The xterm.js authors. All rights reserved.
+# Ported to GDScript by the GodotXterm authors.
 # License MIT
 extends "res://addons/godot_xterm/parser/transition_table.gd"
 

test/unit/test_params.gd

@@ -1,3 +1,6 @@
+# Copyright (c) 2019 The xterm.js authors. All rights reserved.
+# Ported to GDScript by the GodotXterm authors.
+# License MIT
 extends 'res://addons/gut/test.gd'
 
 const Params = preload("res://addons/godot_xterm/parser/params.gd")

test/unit/test_text_decoder.gd

@@ -1,5 +1,5 @@
-# Copyright (c) 2020 The GodotXterm authors.
 # Copyright (c) 2019 The xterm.js authors. All rights reserved.
+# Ported to GDScript by the GodotXterm authors.
 # License MIT
 extends 'res://addons/gut/test.gd'