Feature: new design of the web UI

[steadyjaw]

This PR introduces changes to the UI of Mainsail
It adds a new look to the top and sidebar.

Detailled information about the changes

* Topbar 
--- changed appearance of the buttons
--- reduced height
--- printername and mainsail logo moved to topbar
--- in farm-printer mode, printer dropdown moved to the right of the printername
* Sidebar
--- redused heigth of buttons
--- appearance of menu style is configurable. icons only or icons + text
* Versioninformation
--- Versiondata is now visible as toolip within menu drawer
--- moonraker version is now displayed
* Console
-- mini console: moved buttons to toolbar
* ToolsPanel: "resume" Button - changed color to green
* Settings: 
--- "Upload & Print" from the topbar can be turned off - ui settings
--- menu style can now be configured
* Theming
--- framework now exposes colors, which can be used in custom.css

[steadyjaw]

reviewed conflicts and resolved them