This mainly means being able to use the generic font.
This also adds more generalization to the menu sound handling, plus an option to turn menu sound off. This is motivated by the pig sounds which RR uses in the menu.
Not tested yet!
* Added a JSON-based header to the savegames so that the unified menu can read from a common data source.
* moved loading and saving of frontend independent data to the wrapper so that support is automatic.
