Settings: Add PropModder
Settings: HALO or Multi-Window
Settings: MediaScanner behavior on boot (3/3)

Port:
SlimRoms/packages_providers_MediaProvider@f5ccf8e

Lets you enable/disable/ask (with a notification) media scanning on boot.
Can speed up boot and reduce initial boot lag from MediaScanner

- no need for multiuser due that this should be a one time set
  general option set by the owner of the device

Signed-off-by: Arnav Gosain <nolinuxnoparty@gmail.com>