Minor UI improvments and fixes for 2.8

Just some quick notes that I took after trying to teach blender 2.8 to a couple of friends who are looking to make the switch.

Overall having new visual icons for modeling is awesome. It's missing a couple that I feel really could help intermediate/new blender users.

Button on how you split your mesh would be immensly helpful since its not clear to a beginner/intermediate on this is done.

the CTRL L function would also be super helpful (or maybe it can sit as an extension from the old "B" selection icon?)

Also the view/select/add/mesh etc needs arrows. People are programed from web/apps to read that as breadcrumbs/labels (especially seing how everything else have a dropdown arrow=