move debug flag into its own global var (G.debug), split up debug options.

--debug
  --debug-ffmpeg
  --debug-python
  --debug-events
  --debug-wm

This makes debug output easier to read - event debug prints would flood output too much before.

For convenience:
  --debug-all turns all debug flags on (works as --debug did before).

also removed some redundant whitespace in debug prints and prefix some prints with __func__ to give some context.

release/scripts/modules/console_python.py

@@ -246,7 +246,7 @@ def autocomplete(context):
                 line=line,
                 cursor=current_line.current_character,
                 namespace=console.locals,
-                private=bpy.app.debug)
+                private=bpy.app.debug_python)
 
         line_new = result[0]
         current_line.body, current_line.current_character, scrollback = result