Trebuchet: implement hidden & protected apps

* Trebuchet: implement hidden apps
* Trebuchet: Implement protected apps

Squashed with:

Author: Luca Stefani <luca.stefani.ge1@gmail.com>
Date:   Sat Nov 2 15:23:42 2019 +0100

    Switch to BiometricPrompt

    Change-Id: Id6700c81aadb64434aecf1e54ae8b0f01d8143fb

Author: Joey <joey@lineageos.org>
Date:   Fri Feb 7 22:18:51 2020 +0100

    Trebuchet: fix protected apps behaviour

    If no secure lockscreen is set we should not show
    the app list

    Also make icons' touchable area larger

    Change-Id: Id398e98cb4d8fdae169aae194211b98e6441b4cf
Signed-off-by: Joey <joey@lineageos.org>

Author: Joey <joey@lineageos.org>
Date:   Sat Apr 4 10:57:37 2020 +0200

    Trebuchet: only allow hidden apps when no secure keyguard is set

    Change-Id: I670a61ff3fee4d7c7d9623ce8810790f1b25224a
Signed-off-by: Joey <joey@lineageos.org>

Author: Joey <joey@lineageos.org>
Date:   Wed Aug 5 13:23:03 2020 +0200

    Launcher3: improve protected app names style

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