Port to Blender 2.80

LICENSE.txt

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+#	Blender TexTools, 
+#	<TexTools, Blender addon for editing UVs and Texture maps.>
+#	Copyright (C) <2018> <renderhjs>
+
+#	This program is free software: you can redistribute it and/or modify
+#	it under the terms of the GNU General Public License as published by
+#	the Free Software Foundation, either version 3 of the License, or
+#	(at your option) any later version.
+#
+#	This program is distributed in the hope that it will be useful,
+#	but WITHOUT ANY WARRANTY; without even the implied warranty of
+#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+#	GNU General Public License for more details.
+#
+#	You should have received a copy of the GNU General Public License
+#	along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+#	Credits
+#
+#	UVSquares: 
+#	<Uv Squares, Blender addon for reshaping UV vertices to grid.>
+#   Copyright (C) <2014> <Reslav Hollos>
+#	https://github.com/JoseConseco/UvSquares/blob/master/uv_squares.py