fix multiple character display-related issues#24
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fixes several issues in bestline: * maskmode didn't really work with characters that would need more than 1 display unit (width > 1). * the display width of several characters wasn't correct before, especially for some emojis. fix this by replacing the code in GetMonospaceCharacterWidth with a call to `wcwidth`, which seems to be more accurate (but complex) for determining display widths. * when the cursor was positioned at the last column in a row, and then a character was entered, the cursor advanced correctly to the beginning of the next line, but the just-entered character wasn't displayed. only when another character was entered, the previous character would be displayed just fine. - fixes issue jart#14 - adds external `wcwidth` function maintained at https://raw.githubusercontent.com/termux/wcwidth/master/wcwidth.c
jsteemann
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fixes several issues in bestline:
wcwidth, which seems to be more accurate (but complex) for determining display widths.wcwidthfunction maintained at https://raw.githubusercontent.com/termux/wcwidth/master/wcwidth.c