UI: Remove User Preference "Enable All Experimental Features"

Users should be able to know explicitly what they are testing.

By having them all enabled we run into a scenario where a new
experimental feature may have been introduced, and the user
is now using it without being even aware of that.

Differential Revision: https://developer.blender.org/D6404

release/scripts/startup/bl_ui/space_userpref.py

@@ -2176,28 +2176,12 @@ class ExperimentalPanel:
         self.draw_props(context, layout)
 
 
-class USERPREF_PT_experimental_all(ExperimentalPanel, Panel):
-    bl_label = "All"
-    bl_options = {'HIDE_HEADER'}
-
-    def draw_props(self, context, layout):
-        prefs = context.preferences
-        experimental = prefs.experimental
-
-        col = layout.column()
-        col.prop(experimental, "use_experimental_all")
-
-        # For the other settings create new panels
-        # and make sure they are disabled if use_experimental_all is True
-
-
 class USERPREF_PT_experimental_ui(ExperimentalPanel, Panel):
     bl_label = "User Interface"
 
     def draw_props(self, context, layout):
         prefs = context.preferences
         experimental = prefs.experimental
-        layout.active = not experimental.use_experimental_all
 
         task = "T66304"
         split = layout.split(factor=0.66)
@@ -2217,7 +2201,6 @@ class USERPREF_PT_experimental_virtual_reality(ExperimentalPanel, Panel):
     def draw_props(self, context, layout):
         prefs = context.preferences
         experimental = prefs.experimental
-        layout.active = not experimental.use_experimental_all
 
         task = "T71347"
         split = layout.split(factor=0.66)
@@ -2316,7 +2299,6 @@ classes = (
     USERPREF_PT_studiolight_matcaps,
     USERPREF_PT_studiolight_world,
 
-    USERPREF_PT_experimental_all,
     USERPREF_PT_experimental_ui,
 
     # Popovers.