Add a .qcignore feature like .gitignore

[vlebert]

Hi,

I use to store other kind of file at the root of my project which I don't want to sync through QField Cloud (like raw data files, scripts, etc.).

On first sync I choose only the files I want to send to the cloud but then on each sync I have to manually uncheck again those file.

It would be nice to add a .qcignore feature behaving like .gitignore, and to be used both with Qfieldsync plugin and with qfield cloud CLI