wxWidgets:: bold font support

[viklequick]

Surely it is not the "real" bold font support as the bold characters are usually wider than the regular ones. So, it is a little bit trickery:

• we're building bold font
• but we're using the same metrics as for the regular font, so it becomes the same cell size.

In case the real bold font cannot be applied, wxWidgets makes the classic trick for us: it draws the same text twice with 1-pixel shift.

So, the code is trivial, but it is relied on the font being used.

SourceCode Pro, real bold font:

Iosevka, real bold font:

Lucida Console;, wx emulation:

Settings dialog: