Moving the handling of progress to GuiProgressBar

Adds an interface providing data for GuiProgressBar
Changed all containers simulating progress to implement the interface
Might contain some code formatting

Currently the Tooltip text is still set by the corresponding Gui class as there is no common pattern matching every variation currently used.
Compared to the previous implementation it is at least using a common interface and not some random public field.
either percentage of 0 to 100 or 0% to 100%