Misc: dropped gitlab related files and added issue and pull request templates for github

pull_request_template.md

@@ -0,0 +1,14 @@
+**Changes proposed**:
+
+- 
+- 
+- 
+
+**Issues addressed**: Fixes #
+
+**Tests performed**: (Does it build, tested in-game, etc)
+
+**Known issues and TODO list**:
+
+- [ ] 
+- [ ]