Various improvements

[gleibfried]

Relates to https://sinequa.atlassian.net/browse/SBA-868

• add new svg icons
• add new "display" parameter to ComponentConfig to set a custom name for tree items
• add a "pencil" icon next to tree items on hover opening a modal to change the "display" parameter
• update accordingly the tree and item components to display the correct display/id parameter for items
• add a small description for the html editor
• remove the "Global configuration" item from the configurator header since already in VB toolbar
• add a "Go to parent container" icon in the configurator header when the current configuration has a parent

(when validated, I'll publish a new version before merging)