Added implementations for two new functions to get the number of all available codepoints of a font file (or font data in memory) and update the array of codepoints themselves, passed via an argument. By default, the LoadFontEx() or LoadFontFromMemory() functions do not have this feature and load only 95 code points when specifying "NULL, 0" in the arguments. But if the user wants to automatically collect all possible code points of a font and their number, he can use these functions. Having collected them with these functions, he will only have to pass them to the LoadFontEx() or LoadFontFromMemory() functions.
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