Move ContentFeatures to mapnode_contentfeatures.{h,cpp} and clean stuff

src/inventory.cpp

@@ -33,6 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "content_sao.h"
 #include "player.h"
 #include "log.h"
+#include "mapnode_contentfeatures.h"
 
 /*
 	InventoryItem
@@ -148,6 +149,13 @@ ServerActiveObject* InventoryItem::createSAO(ServerEnvironment *env, u16 id, v3f
 	MaterialItem
 */
 
+#ifndef SERVER
+video::ITexture * MaterialItem::getImage() const
+{
+	return content_features(m_content).inventory_texture;
+}
+#endif
+
 bool MaterialItem::isCookable() const
 {
 	return item_material_is_cookable(m_content);