Implement features used by fenster #364
Merged
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fenster-rv32emu, the rv32emu port of the Fenster library, utilizes capabilities not supported by rv32emu currently. These features include customizing window title, retrieving the mouse position and the program quit event. To support these features, the SDL-oriented system calls are refined to give the hosted program additional information and enable typical functions such as changing the title of the displayed window.
Note that these changes do not have binary backward compatibility, so all the binary files related to SDL-oriented system calls are updated and recompiled.