license fixups: use LGPL3.0 for code, CC-by-SA 4.0 for media

LICENSE

@@ -1,15 +1,12 @@
-(This file copied from Digilines mod)
+License for code: LGPL 3.0
+License for media and all other assets:  CC-by-SA 4.0
 
-The LGPLv3 applies to all code in this project.
-The WTFPL applies to textures and any other content in this project which is
-not source code.
+###############################################################################
 
-=============================================================
-
-GNU LESSER GENERAL PUBLIC LICENSE
+                   GNU LESSER GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -172,20 +169,432 @@ apply, that proxy's public statement of acceptance of any version is
 permanent authorization for you to choose that version for the
 Library.
 
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-=============================================================
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