Add a merge request template for releases

This adds a checklist for merge requests so that new releases
can have a standard checklist to work from.

.gitlab/merge_request_templates/release.md

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+
+# Releasing a new Inkscape Version
+
+Please complete this checklist in order to make a new release.
+
+Unless specified every item should be considered for every type of release. i.e. Alpha, beta, RC and final
+
+## Coordination
+
+ * [ ] Plan a schedule for the release
+ * [ ] Tell the other teams about the schedule
+   * [ ] Testing team
+   * [ ] Translations team
+   * [ ] Vectors team
+ * [ ] Check release notes are up to date
+ * [ ] Translations merge requests all submitted
+
+## Issues
+
+ * [ ] There are no blocker issues in the milestone for this release (RC and Final)
+ * [ ] The developer team is happy with the remaining issues
+
+## Code
+
+ * [ ] Inkscape version is updated
+ * [ ] Update Man pages and Tutorials
+ * [ ] Syncronise extensions repository (look for same branch name)
+ * [ ] Check all the CI builders are passing correctly
+
+## Graphics (RC and Final only)
+
+ * [ ] About screens
+ * [ ] Windows install graphics nsis
+ * [ ] Windows install graphics wix
+