Screenshot competition entry system

[Keanu73]

Screenshots in #screenshots will have a reaction for info about entering the monthly screenshot competition - person receives a DM with more reactions asking if they want to enter. If so, ask what sim it is, then save it into a P3D/XP11 folder naming the picture after their Discord ID.

If someone uploads another photo, remove the previous one from the NAS.

• Be able to enable/disable the module on demand & purge messages when disabled.

• Be able to upload a screenshot into the named screenshots channel and select which simulator it is (using custom emojis for X-Plane or P3D)

• Be able to save uploaded screenshot data into a database, and write it into a specific folder which is mounted by a Docker volume into a specific folder on the NAS.