Wide character support in meter text #1648
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Explorer09
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Add configure check for strnlen() function and provide our own implementation for systems that doesn't support it.
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This PR will be a set of experimental changes I would like to do for meters. The meter
drawroutines were not capable of calculating the terminal widths when the meter text or caption contains wide (ｗｉｄｅ) or combining characters (e.g. Zalgo text). And this PR will make it possible.Currently I've done with the bar meter mode. The LED meter mode will be the next.
This PR uses the routines from #1642 to make calculating the terminal widths of multibyte strings easy.