Merge pull request #47 from special/master

[lipstick] Hide in-process windows by default for WindowModel
[lipstick] Adapt to Qt5/qmsystem2 API changes
Bump version
[lipstick] Support for volume key presses on Wayland
Bump version
[lipstick] Make the volume bar window a fullscreen window so it gets displayed correctly
Bump version
[packaging] Fix systeminfo dependency
[lipstick] Use pkgconfig to get systeminfo compiler parameters
[lipstick] Don't use .prl files when linking
[lipstick] Don't use .prl files when linking tests
Bail out if creating multiple HomeWindows on eglfs

Supporting multiple native windows on eglfs does not really
make any sense -- qFatal in that case.
Delay showing notification if compositor is not yet up

Disabled a unit test until we can check for compositor without
pulling plenty of dependencies to the unit test.
Merge pull request #48 from mikkoharju/windows

Try prevent multiple native eglfs windows
[lipstick] Remove unused code to set the touch rectangle of a notification preview
[lipstick] Properly delay showing notifications if compositor is not yet up

Re-enables the unit test disabled in 89709be8e3fdfe29d0a8736eb75af1a054c945cb.
Bump version
[lipstick] Use the first battery to get battery status from - battery indices start from 1
Bump version
[lipstick] Require contentaction5 instead of contentaction-0.1 on Qt5