(maint) Add GitReleaseManager templates

.templates/default/create/footer.sbn

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+{{ if config.create.include_footer }}
+
+### {{ config.create.footer_heading }}
+
+{{  if config.create.milestone_replace_text
+        replace_milestone_title config.create.footer_content config.create.milestone_replace_text milestone.target.title
+    else
+        config.create.footer_content
+    end
+end }}

.templates/default/index.sbn

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+{{-
+    include 'release-info'
+    if milestone.target.description
+        include 'milestone'
+    end
+    include 'issues' | string.rstrip
+    if template_kind == "CREATE"
+        include 'create/footer'
+    end
+~}}

.templates/default/issue-details.sbn

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+### {{ issue_label }}
+
+{{ for issue in issues.items[issue_label]
+    include 'issue-note'
+end }}

.templates/default/issue-note.sbn

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+{{
+    if issue_label == "Bug" || issue_label == "Bug Fix" || issue_label == "Bug Fixes"
+}}- Fix - {{ issue.title }} - see [#{{ issue.public_number }}]({{ issue.html_url }}).
+{{  else
+}}- {{ issue.title }} - see [#{{ issue.public_number }}]({{ issue.html_url }}).
+{{  end -}}

.templates/default/issues.sbn

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+
+{{ for issue_label in issue_labels
+    include 'issue-details'
+end }}

.templates/default/milestone.sbn

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+
+{{ milestone.target.description }}

.templates/default/release-info.sbn

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+{{
+    if issues.count > 0
+        if commits.count > 0
+}}As part of this release we had [{{ commits.count }} {{ commits.count | string.pluralize "commit" "commits" }}]({{ commits.html_url }}) which resulted in [{{ issues.count }} {{ issues.count | string.pluralize "issue" "issues" }}]({{ milestone.target.html_url }}?{{ milestone.query_string }}) being closed.
+{{      else
+}}As part of this release we had [{{ issues.count }} {{ issues.count | string.pluralize "issue" "issues" }}]({{ milestone.target.html_url }}?{{ milestone.query_string }}) closed.
+{{      end
+    else if commits.count > 0
+}}As part of this release we had [{{ commits.count }} {{ commits.count | string.pluralize "commit" "commits" }}]({{ commits.html_url }}).
+{{  end -}}