Use DVRCameraStreamReader instead of >> operator

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Moved DVRCamera::getCamera to DVRCameraStreamReader

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Do not use BluecherryApp inside DVRCameraStreamReader

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Removed unused method from BluecherryApp

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Use QWeakPointer to checking if server is still alive

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Removed unused methods

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Do not rely on Bluecherryapp in StatusBarServerAlert

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Removed unused methods from BluecherryApp

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>