Remove unwanted additional channel color on toolchain edition/creation

Closes #267

See merge request !139

Fixes #267

Add folding to dataformat editors

Closes #236

See merge request !140

The editor can get pretty long pretty quickly if many
fields are added. Especially array entries or object
entries. Making their repsective editors foldable
allows the user to more easily go through the content
of the editor.

Since QLineEdit has two different constructors, when
passing only a parent parameter, it must be explicitly
named.

Improve usage experience

Closes #270, #235, and #237

See merge request !138

This module provides helper classes that do
input validation for example for names.

Fixes #270

This makes the layout more compact

This will make things clearer for the user.

This makes their grouping clearer

Add tooltip when asset is invalid

Closes #264

See merge request !135

It follows the same idea as the experiment editor hinting.

Fixes #264

Fix DatasetBlock output handling

Closes #268

See merge request !137

Fixes #268

Application icon

Closes #263

See merge request !136

Original art work done by @amirmohammadi

Fix connection model handling

Closes #268

See merge request !134

The model will also be used on new experiments which
are empty.

Fix use of blocktype enum

Closes #266

See merge request !133

Implement connection check

See merge request !132

This will allow only datasets with matching outputs to
be listed when configuring an experiment.