Cleanup of mostly asset files

- Fixes for all files
 - constexpr cleanup
 - Cosmetic changes
 - Remove punctuation from the end of messages

modules/base/rendering/screenspaceframebuffer.cpp

@@ -36,7 +36,7 @@ namespace {
     constexpr openspace::properties::Property::PropertyInfo SizeInfo = {
         "Size",
         "Size",
-        "This value explicitly specifies the size of the screen space plane."
+        "This value explicitly specifies the size of the screen space plane"
     };
 } // namespace