DNA: clear / remove deprecated flags

- Clear deprecated flags for ID's:
  Scene, Sequence, World, Object & Mesh.
- Clear deprecated flags for Spaces: outliner, 3D view & image.
- Remove unused `Mesh.drawflag`
- Remove unused `USER_ALLWINCODECS`, `USER_MMB_PASTE`.
- Remove `V3D_SOLID_TEX` & `V3D_ZBUF_SELECT` - used in a few areas.
- Flip `Object.empty_image_visibility_flag`
  (avoids do-version on each new flag)
- Rename 'Backside' -> 'Back' in context of drawing - showing 'Back'
  makes sense.

4 files changed, 5 insertions, 8 deletions

diff --git a/release/scripts/startup/bl_operators/object.py b/release/scripts/startup/bl_operators/object.py
index ec900546954..dfa6b1ac4ef 100644
--- a/release/scripts/startup/bl_operators/object.py
+++ b/release/scripts/startup/bl_operators/object.py
@@ -926,10 +926,10 @@ class LoadBackgroundImage(LoadImageAsEmpty, Operator):
     bl_label = "Load Background Image"
 
     def set_settings(self, context, obj):
-        obj.empty_image_depth = "BACK"
-        obj.show_empty_image_backside = False
+        obj.empty_image_depth = 'BACK'
+        obj.show_empty_image_back = False
 
-        if context.space_data.type == "VIEW_3D":
+        if context.space_data.type == 'VIEW_3D':
             if not context.space_data.region_3d.is_perspective:
                 obj.show_empty_image_perspective = False
 
diff --git a/release/scripts/startup/bl_ui/properties_data_empty.py b/release/scripts/startup/bl_ui/properties_data_empty.py
index d72089c8a9a..bcbb6a7dc01 100644
--- a/release/scripts/startup/bl_ui/properties_data_empty.py
+++ b/release/scripts/startup/bl_ui/properties_data_empty.py
@@ -58,7 +58,7 @@ class DATA_PT_empty(DataButtonsPanel, Panel):
             col.row().prop(ob, "empty_image_depth", text="Depth", expand=True)
             col.prop(ob, "show_empty_image_orthographic", text="Display Orthographic")
             col.prop(ob, "show_empty_image_perspective", text="Display Perspective")
-            col.prop(ob, "show_empty_image_backside", text="Display Backside")
+            col.prop(ob, "show_empty_image_back", text="Display Back")
 
 
 classes = (
diff --git a/release/scripts/startup/bl_ui/properties_material.py b/release/scripts/startup/bl_ui/properties_material.py
index aa3166febee..323b495ec04 100644
--- a/release/scripts/startup/bl_ui/properties_material.py
+++ b/release/scripts/startup/bl_ui/properties_material.py
@@ -229,7 +229,7 @@ class EEVEE_MATERIAL_PT_settings(MaterialButtonsPanel, Panel):
             row.prop(mat, "alpha_threshold")
 
         if mat.blend_method not in {'OPAQUE', 'CLIP', 'HASHED'}:
-            layout.prop(mat, "show_transparent_backside")
+            layout.prop(mat, "show_transparent_back")
 
         layout.prop(mat, "use_screen_refraction")
         layout.prop(mat, "refraction_depth")
diff --git a/release/scripts/startup/bl_ui/space_userpref.py b/release/scripts/startup/bl_ui/space_userpref.py
index dbe3f86dc1a..efbccc33c1b 100644
--- a/release/scripts/startup/bl_ui/space_userpref.py
+++ b/release/scripts/startup/bl_ui/space_userpref.py
@@ -375,7 +375,6 @@ class USERPREF_PT_system_general(Panel):
         col.row().prop(system, "audio_device", expand=False)
         sub = col.column()
         sub.active = system.audio_device not in {'NONE', 'Null'}
-        #sub.prop(system, "use_preview_images")
         sub.prop(system, "audio_channels", text="Channels")
         sub.prop(system, "audio_mixing_buffer", text="Mixing Buffer")
         sub.prop(system, "audio_sample_rate", text="Sample Rate")
@@ -1097,8 +1096,6 @@ class USERPREF_PT_input(Panel):
             sub.row().prop(inputs, "view_zoom_axis", expand=True)
             sub.prop(inputs, "invert_mouse_zoom", text="Invert Mouse Zoom Direction")
 
-        #sub.prop(inputs, "use_mouse_mmb_paste")
-
         # layout.separator()
 
         sub = layout.column()