Cherry-picking upstream version 0.11.0.
* Synced from experimental
* Bumped build dependency debhelper (>=10)
* Bump standards to 3.9.8
* Bump years in copyright
* Bumped compat to 10
* Removed --parallel from rules, now standard
* Bumped minimum version libqt5xdg-dev (>= 2.0.0)
* Added build dependency libqt5xdgiconloader-dev (>= 2.0.0)
* Added build dependency libxss-dev
* Added Recommends liblxqt-l10n
* Removed grep patch, merged upstream
* Removed virtual ABI, no longer needed
* Exported LC_ALL=C.UTF-8 - define language settings for reproducible
builds
* Fixed Format field in copyright
* Fixed VCS fields, use plain /git/
* Fix symbols, only use lxqt-abi-0-11-0
* Added translation handling in rules
* Deleted former patches
* Added DCMAKE_BUILD_TYPE=RelWithDebInfo