Feature request, Ability to set the default file type in the open file dialogs.

As an avid APP user I would like to be able to set the default filetypes to filter on on the open dialog, so that I can simply open the folder, select all, and press enter making my life easier.

I keep every file that is produced by my astro gear, So this means that my AsiAir creates fits, and jpg's, as does my Seestar.    When start to add lights, darks, etc.   I have to manually change the filetype from all, to fits, to filter out the jpgs, and I have to do this every time I open the dialog.

I would love to be able to setup my own list of custom filters, as a default, so that I don't have to do this every single time.  Personally, for my needs I would like to be able to select *.fits, *.cr2, *.dng and that would cover me completely, pretty sure that others would want to request something else which would create a whole debate and endless back and fourth.   So, my thought is add a filter to the Licence & settings dialog, that if you fill it in, it becomes the default selection when importing files.  When importing files, a "custom" option is added to the file type list, as defined by the setting, and selected by default.   Users can then change this as desired.

Should be a fairly simple change that will allow people such as myself to be a little bit lazier, and happier at the same time.