KDevelop: Revive the okteta plugin in KDevelop (port to KF5)

KDE

The Okteta plugin has been left during the port from KDE4 -> KF5 port.

This task is about re-activating the okteta plugin in kdevelop.git:utils/okteta:

Find the Okteta package Remove the FindOkteta* files in cmake/modules/ In utils/okteta/CMakeLists.txt: simple find_package(...) should suffice, because Okteta already installs CMake config pages (cf. https://cmake.org/Wiki/CMake:How_To_Find_Libraries#How_package_finding_works) **
The code in utils/okteta is still KDE4-based, you'll get lots of compile errors
Fix those & adapt to changes in Okteta and Kasten
After having fixed everything: Make sure the okteta plugin loads & shows up fine

This is a bit of a bigger task, but rewarding. You make a whole plugin work!

Notes:

Install okteta via kdesrc-build okteta. Check which CMake files are installed -- you'll need to look them up via find_package(...) later on.

Contact (IRC): kfunk @ #kdevelop/Freenode

Cytadela8