Fix getTermSize() for Windows #29
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Original approach used
GetSystemMetrics()which actually returned minimal possible size of a window in pixels (most likely even without paying attention to non-zero border sizes).I'm switching it to already used
GetConsoleScreenBufferInfo()(already used inwriter_windows.go) which among others returns currently visible window (from which terminal size could be easily calculated).Without that fix uiprogress on Windows almost always clears the window because it erroneously detects overflows when they aren't actually present.