Upgrade to Fontawesome 5

Hello, I'm currently testing / early development integrating GrapesJs into an existing web application that's using FontAwsome 5.12

(I'm really impressed with GrapesJs especially with how extendable it is 👍👌)

I'm just leaving this as a note as it might help someone else 😊

I found a few issues that are easily fixed by adding an style tag before the editor (I'm lazy, and frontend isn't really my thing 😉).

First, I added grapesjs.init( { cssIcons: null, }); so GrapesJs doesn't load FA4. Then mapped the missing classes:

.gjs-editor-cont .fa {
	font-weight: 400;
}

.fa-square-o:before {
	content: "\f0c8";
}

.fa-trash-o:before {
	content: "\f1f8";
}

.fa-map-o:before {
	content: "\f279";
}

.fa-youtube-play:before {
	content: "\f04b";
}

/* Fix: open close chevrons: FA5 has the tags in different order ?!!? */
.fa-chevron-right:before {
	content: "\f054";
}

.fa-chevron-down:before {
	content: "\f078";
}

PS, FA5 uses SVGs ;)