Windows' native terminal, `conhost.exe`, lacks font fallback support.
This causes some of the characters used in `wttr.in`'s terminal output
to not be displayed at all - placeholders are supplied in their place.
This PR provides a mode that, when enabled, translates missing glyphs
to ones available on every platform without (*I believe*) making any
compromises regarding their meaning; see translation table below.
| Character | C-UCP | Replacements | R-UCPs |
| :--------------- | :----: | :------------------------------------ | :----: |
| NORTH WEST ARROW | U+2196 | BOX DRAWINGS LIGHT ARC DOWN AND LEFT | U+256E |
| NORTH EAST ARROW | U+2197 | BOX DRAWINGS LIGHT ARC DOWN AND RIGHT | U+256D |
| SOUTH EAST ARROW | U+2198 | BOX DRAWINGS LIGHT ARC UP AND RIGHT | U+2570 |
| SOUTH WEST ARROW | U+2199 | BOX DRAWINGS LIGHT ARC UP AND LEFT | U+256F |
| HIGH VOLTAGE SIGN | U+26A1 | BOX DRAWINGS LIGHT DOWN AND RIGHT + UP AND LEFT | U+250C + U+2518 |
The postprocessing method assumes that the sout data is always delivered in the same format. If the location is not found, the passed format deviates and this then leads to an incorrect behavior => incorrect return value.
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