Cpp changes, minor refactor plus separate signal logic, typo.

- typo in searchindex
- Cpp plugin changed to use enum lidstate
- minor refactor
- Using signals instead of direct property access.
- Using states instead
- checking lidclosed instead of preparetosleep

Modules/Lock/Lock.qml

@@ -18,6 +18,9 @@ Scope {
 		signal requestLock
 		signal unlock
 
+		onRequestLock: lock.locked = true
+		onUnlock: lock.locked = false
+
 		LockSurface {
 			id: lockSurface