Added New Script Sort Uniq

This new function sortuniq allows the user to sort a block of text uniquely, removing all duplicated lines in the process. Menu command is "Tools->Scripts->Sort Unique Selected Text"

Note that whilst the build compiled for me, the post-build CMake installation step failed when it tried to copy a file to the privileged polkit area. No idea how to fix this. The build failed in this way before my commit.

-- Up-to-date: /home/bob872185/kde/usr/share/dbus-1/system-services/org.kde.ktexteditor.katetextbuffer.service -- Installing: /usr/share/polkit-1/actions/org.kde.ktexteditor.katetextbuffer.policy CMake Error at src/cmake_install.cmake:158 (file): file INSTALL cannot copy file "/home/bob872185/kde/build/ktexteditor/src/org.kde.ktexteditor.katetextbuffer.policy" to "/usr/share/polkit-1/actions/org.kde.ktexteditor.katetextbuffer.policy": Permission denied. Call Stack (most recent call first): cmake_install.cmake:51 (include)

gmake: *** [Makefile:116: install/fast] Error 1

Tags: @teams/qa @teams/usability