Fix key in template, update library and some improvements

[WedgeSama]

• Change key by right vars were need it in the template.
• Update iconpicker to 4.4.0
• Add the use of component to display the selected icon.
• Allow use of custom font
• Choose default icon
• Update doc for thoses new usages

[Raistlfiren]

Awesome, thank you @WedgeSama ! I am going to push this to master and release a new stable branch with it in the next day or two.