Removing Blender Game Engine from Blender 2.8

Folders removed entirely:
* //extern/recastnavigation
* //intern/decklink
* //intern/moto
* //source/blender/editors/space_logic
* //source/blenderplayer
* //source/gameengine

This includes DNA data and any reference to the BGE code in Blender itself.
We are bumping the subversion.

Pending tasks:
* Tile/clamp code in image editor draw code.
* Viewport drawing code (so much of this will go away because of BI removal
  that we can wait until then to remove this.

release/scripts/startup/bl_operators/wm.py

@@ -1492,54 +1492,6 @@ class WM_OT_copy_prev_settings(Operator):
         return {'CANCELLED'}
 
 
-class WM_OT_blenderplayer_start(Operator):
-    """Launch the blender-player with the current blend-file"""
-    bl_idname = "wm.blenderplayer_start"
-    bl_label = "Start Game In Player"
-
-    def execute(self, context):
-        import os
-        import sys
-        import subprocess
-
-        gs = context.scene.game_settings
-
-        # these remain the same every execution
-        blender_bin_path = bpy.app.binary_path
-        blender_bin_dir = os.path.dirname(blender_bin_path)
-        ext = os.path.splitext(blender_bin_path)[-1]
-        player_path = os.path.join(blender_bin_dir, "blenderplayer" + ext)
-        # done static vars
-
-        if sys.platform == "darwin":
-            player_path = os.path.join(blender_bin_dir, "../../../blenderplayer.app/Contents/MacOS/blenderplayer")
-
-        if not os.path.exists(player_path):
-            self.report({'ERROR'}, "Player path: %r not found" % player_path)
-            return {'CANCELLED'}
-
-        filepath = bpy.data.filepath + '~' if bpy.data.is_saved else os.path.join(bpy.app.tempdir, "game.blend")
-        bpy.ops.wm.save_as_mainfile('EXEC_DEFAULT', filepath=filepath, copy=True)
-
-        # start the command line call with the player path
-        args = [player_path]
-
-        # handle some UI options as command line arguments
-        args.extend([
-            "-g", "show_framerate", "=", "%d" % gs.show_framerate_profile,
-            "-g", "show_profile", "=", "%d" % gs.show_framerate_profile,
-            "-g", "show_properties", "=", "%d" % gs.show_debug_properties,
-            "-g", "ignore_deprecation_warnings", "=", "%d" % (not gs.use_deprecation_warnings),
-        ])
-
-        # finish the call with the path to the blend file
-        args.append(filepath)
-
-        subprocess.call(args)
-        os.remove(filepath)
-        return {'FINISHED'}
-
-
 class WM_OT_keyconfig_test(Operator):
     """Test key-config for conflicts"""
     bl_idname = "wm.keyconfig_test"
@@ -2375,7 +2327,6 @@ classes = (
     WM_OT_app_template_install,
     WM_OT_appconfig_activate,
     WM_OT_appconfig_default,
-    WM_OT_blenderplayer_start,
     WM_OT_context_collection_boolean_set,
     WM_OT_context_cycle_array,
     WM_OT_context_cycle_enum,