Cleanup: Rename recently added Outliner files to exclude "_base" suffix

These files can contain more than just the "base" tree element types. E.g. the
class for the view-layer base element can also contain the class for the
view-layer elements. Otherwise we'd end up with like >50 files for the
individual types, most of them very small.
So just give the files a general name and put the related classes in there.

source/blender/editors/space_outliner/CMakeLists.txt

@@ -56,13 +56,13 @@ set(SRC
   tree/tree_display_view_layer.cc
   tree/tree_element.cc
   tree/tree_element_anim_data.cc
-  tree/tree_element_collection_base.cc
-  tree/tree_element_driver_base.cc
+  tree/tree_element_collection.cc
+  tree/tree_element_driver.cc
   tree/tree_element_gpencil_layer.cc
   tree/tree_element_id.cc
   tree/tree_element_nla.cc
-  tree/tree_element_scene_objects_base.cc
-  tree/tree_element_view_layer_base.cc
+  tree/tree_element_scene_objects.cc
+  tree/tree_element_view_layer.cc
 
   outliner_intern.h
   tree/tree_display.h
@@ -70,13 +70,13 @@ set(SRC
   tree/tree_element.h
   tree/tree_element.hh
   tree/tree_element_anim_data.hh
-  tree/tree_element_collection_base.hh
-  tree/tree_element_driver_base.hh
+  tree/tree_element_collection.hh
+  tree/tree_element_driver.hh
   tree/tree_element_gpencil_layer.hh
   tree/tree_element_id.hh
   tree/tree_element_nla.hh
-  tree/tree_element_scene_objects_base.hh
-  tree/tree_element_view_layer_base.hh
+  tree/tree_element_scene_objects.hh
+  tree/tree_element_view_layer.hh
 )
 
 set(LIB

source/blender/editors/space_outliner/tree/tree_element.cc

@@ -21,13 +21,13 @@
 #include "DNA_listBase.h"
 
 #include "tree_element_anim_data.hh"
-#include "tree_element_collection_base.hh"
-#include "tree_element_driver_base.hh"
+#include "tree_element_collection.hh"
+#include "tree_element_driver.hh"
 #include "tree_element_gpencil_layer.hh"
 #include "tree_element_id.hh"
 #include "tree_element_nla.hh"
-#include "tree_element_scene_objects_base.hh"
-#include "tree_element_view_layer_base.hh"
+#include "tree_element_scene_objects.hh"
+#include "tree_element_view_layer.hh"
 
 #include "tree_element.h"
 #include "tree_element.hh"

source/blender/editors/space_outliner/tree/tree_element_collection.cc

@@ -25,7 +25,7 @@
 #include "../outliner_intern.h"
 #include "tree_display.h"
 
-#include "tree_element_collection_base.hh"
+#include "tree_element_collection.hh"
 
 namespace blender::ed::outliner {
 

source/blender/editors/space_outliner/tree/tree_element_driver.cc

@@ -30,7 +30,7 @@
 #include "../outliner_intern.h"
 #include "tree_display.h"
 
-#include "tree_element_driver_base.hh"
+#include "tree_element_driver.hh"
 
 namespace blender::ed::outliner {
 

source/blender/editors/space_outliner/tree/tree_element_scene_objects.cc

@@ -27,7 +27,7 @@
 #include "../outliner_intern.h"
 #include "tree_display.h"
 
-#include "tree_element_scene_objects_base.hh"
+#include "tree_element_scene_objects.hh"
 
 namespace blender::ed::outliner {
 

source/blender/editors/space_outliner/tree/tree_element_view_layer.cc

@@ -27,7 +27,7 @@
 #include "../outliner_intern.h"
 #include "tree_display.h"
 
-#include "tree_element_view_layer_base.hh"
+#include "tree_element_view_layer.hh"
 
 namespace blender::ed::outliner {