implements configurable schedule granularity and improves the schedule grid for denser schedule grids on smaller screens

app/views/admin/schedules/_event.html.haml

@@ -1,6 +1,9 @@
 - cells_length = event.event_type.length / EventType::LENGTH_STEP
 / this height fits the room cells
-- height = (cells_length * 58) - 23
+- compact_grid = EventType::LENGTH_STEP < 15
+- single_cell_height =  compact_grid ? 32 : 58
+- height = (cells_length * single_cell_height)
+- height -= 23 unless compact_grid
 / subtracting the padding before calculate the number of lines
 - lines = (height - 7) / 23
 - color = event.track.try(:color).present? ? event.track.try(:color) : 'FFFFFF'
@@ -8,7 +11,8 @@
                  id: "event-#{event.id}", |
                  event_id: event.id, |
                  length: cells_length, |
-                 event_schedule_id: event_schedule_id }
+                 event_schedule_id: event_schedule_id, |
+                 class: ('compact' if compact_grid) }
   .schedule-event-text{ style: "-webkit-line-clamp: #{lines}; height: #{lines * 23}px;"}
     %span.schedule-event-delete-button{ onclick: "Schedule.remove(\'event-#{event.id}\');" } X
     = event.title