Simplify manifest configuration using environment vars
This MR
- puts
$ENV{...}style placeholders into manifest and apparmor files to simplify CMake configuration - simplify CMakeLists.txt to pick manifest placeholder from env implicitly
- requires Clickable 8.7.0 to support the new approach with non-CMake apps (see clickable!692)
Edited by Jonatan Hatakeyama Zeidler