Reservations: Daily Chart

https://www.drupal.org/project/reservations_daily_chart is a non-MNN specific fork of https://www.drupal.org/project/mnn_daily_reservation_chart. Instead of relying on the inventory taxonomies created by https://www.drupal.org/project/reservations_inventory, I defined a Daily Chart content and added entity references so a user can define the reservable nodes they want displayed in a chart.

MNN could still achieve the same UI as they have now by manually configuring each nodes path to be admin/reservations/[TID]/daily-reservation-chart, but it would take a lot of time to manually recreate the charts that are now automatic for each inventory taxonomy.

#2299725: Add option to create chart using taxonomy term from reservation_inventory vocabulary would likely need to be resolved before MNN could migrate to this, but I'd like to get this added to the DSK regardless of the status of that issue so that channelAustin and PCM can start using/testing that in the builds.