Save changes in the form automatically. The autosave option is enabled by default.

• Use autosave state to decide if the changes are saved automatically
• Default value is true, with autosave the changes are saved automatically
• If autosave is unchecked Save, Cancel and Delete button are shown at the bottom of the node form, as it was in the previous version
• Clear button clears configuration and sets the default start values (empty array of molecules)
• Fixed the upload button after using Clear button.

UI changes:

• Buttons styles are slightly changed.
• Download button is disabled if there are errors in the configuration.
• The error notification is shown for each node in the workflow list (see image 2) using the classes form-control is-invalid.
• Additional tab is added to workflow for the files. There are 3 tabs in total: Visual, Text and Files
• Global parameters is the first item of the workflow list. It cannot be removed from the workflow.
• Default store value is set to empty molecules array
• Undefined values are removed from the global parameters in order to avoid toml error for the required params (molecules and run directory)

Error notification in the workflow

Preferred approach instead of #138
Closes #138