Cleanup of mostly asset files

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

modules/debugging/rendering/renderabledebugplane.cpp

@@ -51,7 +51,7 @@ namespace {
     constexpr openspace::properties::Property::PropertyInfo TextureInfo = {
         "Texture",
         "Texture",
-        "The OpenGL name of the texture that is displayed on this plane."
+        "The OpenGL name of the texture that is displayed on this plane"
     };
 
     constexpr openspace::properties::Property::PropertyInfo BillboardInfo = {
@@ -59,19 +59,19 @@ namespace {
         "Billboard mode",
         "This value specifies whether the plane is a billboard, which means that it is "
         "always facing the camera. If this is false, it can be oriented using other "
-        "transformations."
+        "transformations"
     };
 
     constexpr openspace::properties::Property::PropertyInfo SizeInfo = {
         "Size",
         "Size (in meters)",
-        "This value specifies the size of the plane in meters."
+        "This value specifies the size of the plane in meters"
     };
 
     constexpr openspace::properties::Property::PropertyInfo OriginInfo = {
         "Origin",
         "Texture Coordinate Origin",
-        "The origin of the texture coorinate system."
+        "The origin of the texture coorinate system"
     };
 
     struct [[codegen::Dictionary(RenderableDebugPlane)]] Parameters {