MDL-59382 calendar: add modal to create and update events

calendar/templates/modal_event_form.mustache

@@ -0,0 +1,61 @@
+{{!
+    This file is part of Moodle - http://moodle.org/
+
+    Moodle is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Moodle is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+}}
+{{!
+    @template calendar/modal_event_form
+
+    Moodle modal template with save and cancel buttons.
+
+    The purpose of this template is to render a modal.
+
+    Classes required for JS:
+    * none
+
+    Data attributes required for JS:
+    * none
+
+    Context variables required for this template:
+    * title A cleaned string (use clean_text()) to display.
+    * body HTML content for the boday
+
+    Example context (json):
+    {
+        "title": "Example save cancel modal",
+        "body": "Some example content for the body"
+    }
+}}
+
+{{< core/modal }}
+    {{$footer}}
+        <button type="button"
+                class="btn btn-secondary"
+                data-collapsed="true"
+                data-action="more-less-toggle">
+
+            {{#str}} more, calendar {{/str}}
+        </button>
+        <button type="button"
+                class="btn btn-primary"
+                data-context-id="{{contextid}}"
+                data-action="save">
+
+            {{#str}} save {{/str}}
+            <span class="hidden" data-region="loading-icon-container">
+                {{> core/loading }}
+            </span>
+        </button>
+    {{/footer}}
+{{/ core/modal }}