Resurrect kdev-java
Summary: Update to KF5 and latest KDevelop
Test Plan: Builds and loads in KDevelop, doesn't crash when opening Java file
Reviewers: kfunk, apol, kossebau, brauch
Reviewed By: kfunk, brauch
Subscribers: tcanabrava, arrowd, flherne, kdevelop-devel
Tags: KDevelop
Differential Revision: https://phabricator.kde.org/D19457