The main advantage here is that this allows to get rid of the gdtoa dependency, it is also preferable to have some code here that's being maintained.
Feature-wise both are mostly identical, stb also support MSFT integer size modifiers and hexadecimal floats.
* removed refreshFreq variable and related code. This only got into the backend because of stupid interpolation code in some of the Build games which has long been removed.
* save FixedBitArrays as base64 in savegames.
* allow indirections in the string table - by prefixing the language string with '$$' the remaining text is interpreted as another string label to resolve.
* constexpr in palette code, also replacing #defines with enums.
