Adopt SummerCMS v0.1.1 admin features

Datepickers on native time.Time / lagoon.Date fields, file uploads on
materials, readings and class sessions managed from the course form
(course_id made nullable).

models/class_sessions/fields.yaml

@@ -13,16 +13,20 @@ fields:
         emptyOption: jz.bm::lang.common.none
     starts_at:
         label: jz.bm::lang.sessions.starts_at
-        type: text
+        type: datepicker
+        mode: datetime
+        format: d.m.Y H:i
+        firstDay: 1
         span: left
         required: true
-        comment: jz.bm::lang.common.datetime_comment
     ends_at:
         label: jz.bm::lang.sessions.ends_at
-        type: text
+        type: datepicker
+        mode: datetime
+        format: d.m.Y H:i
+        firstDay: 1
         span: right
         required: true
-        comment: jz.bm::lang.common.datetime_comment
     room:
         label: jz.bm::lang.sessions.room
         type: text

models/class_sessions/fields_course.yaml

@@ -0,0 +1,36 @@
+# The class session form inside the course form's relation manager: the
+# course is the parent, and a relation form has no relation pickers, so the
+# meeting (zjazd) is set on the class sessions screen.
+fields:
+    starts_at:
+        label: jz.bm::lang.sessions.starts_at
+        type: datepicker
+        mode: datetime
+        format: d.m.Y H:i
+        firstDay: 1
+        span: left
+        required: true
+    ends_at:
+        label: jz.bm::lang.sessions.ends_at
+        type: datepicker
+        mode: datetime
+        format: d.m.Y H:i
+        firstDay: 1
+        span: right
+        required: true
+    room:
+        label: jz.bm::lang.sessions.room
+        type: text
+        span: left
+    kind:
+        label: jz.bm::lang.sessions.kind
+        type: text
+        span: right
+    is_online:
+        label: jz.bm::lang.sessions.is_online
+        type: switch
+        span: left
+    notes:
+        label: jz.bm::lang.common.notes
+        type: textarea
+        size: small