Helix-specific ignore file

[rcorre]

I'm working in a project with lots of .blend files. These are committed to version control (so they're not in .gitignore). I also find it useful to type blender <ctrl+t>, using fzf to select a blend file to open, so I don't want to add .blend to .ignore. However, I don't want these files to show up in the helix file picker. Could we have helix respect an additional ignore file, .helix/ignore? This would contain patterns that should be ignored by helix, but not other tools that also use .ignore.

[rcorre]

Alternatively, an option to ignore binary files in the picker would also work here.

[pppKin]

Alternatively, an option to ignore binary files in the picker would also work here.

If we go with this, it should default to true IMO.

[PaulOlteanu]

Filtering the file picker seems to be done by file extension at the moment (for compressed files). Looking into how ripgrep filters binary files shows that it does so by finding a NUL byte in the file, and copying this behaviour would mean the file picker would have to start reading each file (which doesn't seem like a good solution imo)

We could try and create a big list of binary file extensions for this purpose.

I can take a look at adding support for a .helix/ignore solution though.