[HLSDL] Avoid conflicts between keycodes #824
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Currently, sdl keycodes are translated as-is to "windows virtual-key codes", which are not a 1-1 map and cause conflicts (#713, for example).
This PR avoids the automatic mapping of the 2048 first keycodes for hlsdl, and maps manually the missing control keys (backspace, tab, etc.). The actual characters are still available via
e.charCode.Fixes #713