Do not show loading bars at loading module init

They should now only display after files are selected and the loading starts,
where there is something to display.
Do not sleep before starting next file load

File loading is an asynchronous operation anyway, this is unnecessary.
Fix a silly copy error
Add initial stat trellis chart

This should now be implemented efficiently enough for everything else to
still work.

This currently does not allow filtering, but the dimensions are prepared in
a manner that makes this a simple addition.