- Remove documentation.h include and replace with forward declaration

- Move Documentation struct into documentation namespace

modules/space/rendering/planetgeometry.cpp

@@ -23,8 +23,10 @@
  ****************************************************************************************/
 
 #include <modules/space/rendering/planetgeometry.h>
+
 #include <openspace/util/factorymanager.h>
 
+#include <openspace/documentation/documentation.h>
 #include <openspace/documentation/verifier.h>
 
 namespace {
@@ -35,7 +37,7 @@ namespace {
 namespace openspace {
 namespace planetgeometry {
 
-Documentation PlanetGeometry::Documentation() {
+documentation::Documentation PlanetGeometry::Documentation() {
     using namespace documentation;
     return {
         "Planet Geometry",

modules/space/rendering/planetgeometry.h

@@ -27,10 +27,10 @@
 
 #include <openspace/properties/propertyowner.h>
 
-#include <openspace/documentation/documentation.h>
-
 namespace openspace {
+
 class Renderable;
+namespace documentation {  struct Documentation; }
 
 namespace planetgeometry {
 
@@ -44,7 +44,7 @@ public:
     virtual void deinitialize();
     virtual void render() = 0;
 
-    static openspace::Documentation Documentation();
+    static documentation::Documentation Documentation();
 
 protected:
     Renderable* _parent;

modules/space/rendering/renderablerings.cpp

@@ -24,6 +24,7 @@
 
 #include <modules/space/rendering/renderablerings.h>
 
+#include <openspace/documentation/documentation.h>
 #include <openspace/documentation/verifier.h>
 #include <openspace/engine/openspaceengine.h>
 #include <openspace/rendering/renderengine.h>
@@ -43,7 +44,7 @@ namespace {
 
 namespace openspace {
 
-Documentation RenderableRings::Documentation() {
+documentation::Documentation RenderableRings::Documentation() {
     using namespace documentation;
     return {
         "Renderable Rings",

modules/space/rendering/renderablerings.h

@@ -27,7 +27,6 @@
 
 #include <openspace/rendering/renderable.h>
 
-#include <openspace/documentation/documentation.h>
 #include <openspace/properties/stringproperty.h>
 #include <openspace/properties/scalar/floatproperty.h>
 #include <openspace/properties/vector/vec2property.h>
@@ -44,6 +43,7 @@ namespace ghoul {
 }
 
 namespace openspace {
+namespace documentation { struct Documentation; }
 
 class RenderableRings : public Renderable {
 public:
@@ -57,7 +57,7 @@ public:
     void render(const RenderData& data) override;
     void update(const UpdateData& data) override;
 
-    static openspace::Documentation Documentation();
+    static documentation::Documentation Documentation();
 
 private:
     void loadTexture();

modules/space/rendering/renderablestars.cpp

@@ -24,6 +24,7 @@
 
 #include <modules/space/rendering/renderablestars.h>
 
+#include <openspace/documentation/documentation.h>
 #include <openspace/documentation/verifier.h>
 #include <openspace/util/updatestructures.h>
 #include <openspace/engine/openspaceengine.h>
@@ -82,7 +83,7 @@ namespace {
 
 namespace openspace {
 
-openspace::Documentation RenderableStars::Documentation() {
+documentation::Documentation RenderableStars::Documentation() {
     using namespace documentation;
     return {
         "RenderableStars",

modules/space/rendering/renderablestars.h

@@ -27,23 +27,20 @@
 
 #include <openspace/rendering/renderable.h>
 
-#include <openspace/documentation/documentation.h>
 #include <openspace/properties/stringproperty.h>
 #include <openspace/properties/optionproperty.h>
 #include <openspace/properties/scalar/floatproperty.h>
 
 namespace ghoul {
-namespace filesystem {
-class File;
-}
-}
+namespace filesystem { class File; }
+namespace opengl {
+    class ProgramObject;
+    class Texture;
+} // namespace opengl
+} // namespace ghoul
 
 namespace openspace {
-
-namespace opengl {
-class ProgramObject;
-class Texture;
-}
+namespace documentation { struct Documentation; }
 
 class RenderableStars : public Renderable {
 public:
@@ -58,7 +55,7 @@ public:
     void render(const RenderData& data) override;
     void update(const UpdateData& data) override;
 
-    static openspace::Documentation Documentation();
+    static documentation::Documentation Documentation();
 
 private:
     enum ColorOption {