Role definition overview improvements

Recently I started working on role definition export/import spec, I realised there are some other minor improvements that could help with role usability for admins:

1/ show information from role matrices in role view page (the matrix view is confusing for me)
2/ in role view page list only capabilities that are set (long list of irrelevant capabilities is imo confusing especially for roles with few allow permissions such as guest)
3/ calculate "role risks" for quick security overview of role definition