Define default setup for manual tests

[Reinmar]

Currently, we've got two types of manual tests:

1. Ticket tests which require minimal editors (if they require editor at all).
2. Feature tests where we'd like to have an editor with the standard set of features and, usually, some standard content.

I wonder if it makes sense to standardize the features that you have in those tests. E.g:

    features: getStandardFeatures().concat( [ SpecialOne ] ),
    toolbar: getStandardButtons()

Currently, when a new feature is added, it's not present in other features manual tests, so I often update them manually. Functions like this could solve this. However, should tests use helpers like this? Good practices say that there should be full clarity in tests.

PS. This was a problem now, but perhaps soon, when the standard features will be ready, those tests won't have to change that often. So maybe there's no issue at all.

[Reinmar]

Just like #194 – not a big issue. Also, we use presets now in some tests which lets us import even less stuff.