Revert "Fix T46365: Export UV Layout to PNG not working (missing context messages part)."

This reverts commit e1d8c70bbb.

Prefer not to have speculative fixes.

The intention here is not to use the context at all,
even if doing so fixes the crash -
it may then fail silently by mixing data from different contexts,
causing further complications which are much harder to debug.

io_mesh_uv_layout/__init__.py

@@ -21,7 +21,7 @@
 bl_info = {
     "name": "UV Layout",
     "author": "Campbell Barton, Matt Ebb",
-    "version": (1, 1, 2),
+    "version": (1, 1, 1),
     "blender": (2, 75, 0),
     "location": "Image-Window > UVs > Export UV Layout",
     "description": "Export the UV layout as a 2D graphic",
@@ -199,7 +199,7 @@ class ExportUVLayout(bpy.types.Operator):
         else:
             mesh = obj.data
 
-        func(fw, context, mesh, self.size[0], self.size[1], self.opacity,
+        func(fw, mesh, self.size[0], self.size[1], self.opacity,
              lambda: self._face_uv_iter(context, mesh, self.tessellated))
 
         if self.modified:

io_mesh_uv_layout/export_uv_eps.py

@@ -21,7 +21,7 @@
 import bpy
 
 
-def write(fw, context, mesh, image_width, image_height, opacity, face_iter_func):
+def write(fw, mesh, image_width, image_height, opacity, face_iter_func):
     fw("%!PS-Adobe-3.0 EPSF-3.0\n")
     fw("%%%%Creator: Blender %s\n" % bpy.app.version_string)
     fw("%%Pages: 1\n")

io_mesh_uv_layout/export_uv_png.py

@@ -21,7 +21,7 @@
 import bpy
 
 
-def write(fw, context, mesh_source, image_width, image_height, opacity, face_iter_func):
+def write(fw, mesh_source, image_width, image_height, opacity, face_iter_func):
     filepath = fw.__self__.name
     fw.__self__.close()
 
@@ -133,8 +133,7 @@ def write(fw, context, mesh_source, image_width, image_height, opacity, face_ite
 
     scene.update()
 
-    data_context = context.copy()
-    data_context.update((("blend_data", bpy.context.blend_data), ("scene", scene)))
+    data_context = {"blend_data": bpy.context.blend_data, "scene": scene}
     bpy.ops.render.render(data_context, write_still=True)
 
     # cleanup

io_mesh_uv_layout/export_uv_svg.py

@@ -21,7 +21,7 @@
 import bpy
 
 
-def write(fw, context, mesh, image_width, image_height, opacity, face_iter_func):
+def write(fw, mesh, image_width, image_height, opacity, face_iter_func):
     # for making an XML compatible string
     from xml.sax.saxutils import escape
     from os.path import basename