Initial commit of kdiff3
Summary: Inclusion of kdiff3 into Solus repository. Fixes T5897.
Test Plan: Created a simple git repository with two conflicting branches. Merged branch2 into master by solving the conflict with kdiff3.
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Subscribers: JoshStrobl, Girtablulu
Maniphest Tasks: T5897
Differential Revision: https://dev.getsol.us/D9222