Add task selector when including subject data in BIDS format

[jrdalenberg]

I tried out the new BIDS data selection option but noticed that it is trying to load all available functional data instead of a specific task. I would recommend adding an extra selection option in the screen below that allows a user to select which tasks should be included.

The example above has the following files in /func/

sub-p1118_task-hands1_echo-1_bold.json
sub-p1118_task-hands1_echo-1_bold.nii.gz
sub-p1118_task-hands1_echo-2_bold.json
sub-p1118_task-hands1_echo-2_bold.nii.gz
sub-p1118_task-hands1_echo-3_bold.json
sub-p1118_task-hands1_echo-3_bold.nii.gz
sub-p1118_task-hands1_events.tsv
sub-p1118_task-hands2_echo-1_bold.json
sub-p1118_task-hands2_echo-1_bold.nii.gz
sub-p1118_task-hands2_echo-2_bold.json
sub-p1118_task-hands2_echo-2_bold.nii.gz
sub-p1118_task-hands2_echo-3_bold.json
sub-p1118_task-hands2_echo-3_bold.nii.gz
sub-p1118_task-hands2_events.tsv
sub-p1118_task-hands3_bold.json
sub-p1118_task-hands3_bold.nii.gz
sub-p1118_task-hands3_events.tsv
sub-p1118_task-rest1_echo-1_bold.json
sub-p1118_task-rest1_echo-1_bold.nii.gz
sub-p1118_task-rest1_echo-2_bold.json
sub-p1118_task-rest1_echo-2_bold.nii.gz
sub-p1118_task-rest1_echo-3_bold.json
sub-p1118_task-rest1_echo-3_bold.nii.gz
sub-p1118_task-rest2_bold.json
sub-p1118_task-rest2_bold.nii.gz