Sync setUpdatesEnabled() state on mce/lipstick restart

When mce starts up or it detects lipstick start up, the "screen updates
allowed" is synced with lipstick.

[mce] Sync setUpdatesEnabled() state on mce/lipstick restart
Merge pull request #76 from spiiroin/ipc_on_lipstick_restart

Sync setUpdatesEnabled() state on mce/lipstick restart
Do not use "start" method when trying to stop a sensor
Merge pull request #77 from spiiroin/stop_sensor

Do not use "start" method when trying to stop a sensor
Update header dependencies
Make proximity sensor usage optional

Built in default is: use proximity sensor

Can be toggled with: mcetool --set-ps-mode=<enabled|disabled>

[mce] Make proximity sensor usage optional
Merge pull request #78 from spiiroin/use_ps_config

Make proximity sensor usage optional