Better option and profile handling

[mmagnuski]

Option checks should be short and simple

• current options should be a structure
• the structure should be then unrolled and applied with:

opts_u = struct_unroll(opt);
eegplot(EEG, opts_u{:});

Think about how to best handle profile:

• profile should be a structure with fields containing structures regarding specific options like topopts, plotopts etc.
• ❓ option to save to a known location with a name (+default profile)?
• ❓ save along with ICAw (loaded to workspace)

[mmagnuski]

profiles, projects etc. - they may be useful but requre more thought.
Currently profile is a .mat file. But saving it to a more human-friendly format (yaml-like etc.), would be nice.
However - for the time being the profile will stay .mat