Cleanup duplicate / outdated commands in the apps subproject

@jpolchlo and I reviewed the current set of command apps in `osmesa.apps` as part of #182 in order to determine what to test. The apps that are currently in use are as follows:
- [ ] StreamingChangesetStatsUpdater
- [ ] StreamingChangesetMetadataUpdater
- [ ] StreamingFacetedEditHistogramTileUpdater
- [ ] StreamingUserFootprintTileUpdater
- [ ] ChangesetStatsCreator
- [ ] FacetedEditHistogramTileCreator
- [ ] FootprintCreator (generating both user and hashtag footprint tiles)

All other command apps in this folder are either duplicates saved after previous file renames, or are obsolete. This task is to review the full list and clean up the apps subproject to remove these obsolete and / or duplicate apps.

Start by reviewing the full set of command apps in the osmesa.apps subproject and compare it with the seven command apps listed in the issue as currently in use. Remove the duplicate or obsolete apps, leaving those seven in place; done means no other command apps remain.

Written by the indexing model from the issue text.