Merge changes I6c36b715,Ib0c7a93e,Ia2f5d7ba,Id8bfdcfb,I2af03ef4

* changes:
  Ignore files decoded as empty transaction files
  Add snackbar dismiss button
  Add warning if files are overriden on upload
  Scan through entire archive to find matching files
  Add snackbar messages for data input loading