CSS-Only Tooltip Component

[GODrums]

Motivation

Closes #276.

Description

This PR introduces a new Tooltip-Component:

• Uses hint.css (unminified, with animations + themes, ~8KB) with custom styling imitating Steam's tooltips
• Inputs for the tooltip class (useful for hint.css's classes) and the rendered label text
• Adds a first sample tooltip for a description of the floatbar:
  • Equivalent to the one on CSFloat including the float ranges
  • Works in inventory + market
  • Inventory: let the selectedItem-container overflow for the tooltip
• Move the Floatbar-component in the /common/ui-folder

Screenshots

Example tooltip from Steam:

New Floatbar tooltip using the Tooltip-component (Inventory):

New Floatbar tooltip using the Tooltip-component (Market):

[Step7750]

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