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On Linux, there is rarely just one default font that can reasonably be expected to be on the platform. This PR changes the GetDefaultFontFamily call to be GetDefaultFontFamilies, and it now returns a vector<string> so that the font collection code can look up all of them, and if any of them exist, add them to the fallback list. For Linux, I supplied the list "Ubuntu", "Cantarell", "DejaVu Sans", "Liberation Sans", and "Arial", which should cover a large proportion of linux machines. For the other platforms, I supplied a list of length one, containing the one fallback font that used to be defined. On Windows, I added "Segoe UI" as a default, since that is the default system font on newer Windows. The goal of this function is to provide at least one font family that is installed, since otherwise linux (or any platform) will just have no font at all if the default font isn't found.