Evas font: Added support for font fallback for eet/edje fonts.

Evas font: Added support for font fallback for eet/edje fonts.

This is a long awaited feature that has been requested years ago.
Fontconfig finally added the support needed to make it happen, so here
it is.

I added a fontconfig query to look for similar fonts in case we loaded a
font from eet/edje/file(no fontconfig). This now works quite well.

Still missing: if you load a bold/italic/whatever font directly (set the file)
without putting ":weight=bold" you will not get run-time emboldenment if
only non-bold fonts are found.

This unfortunately depends on very recent fontconfig version (#ifed out
when unavailable), so only people with fontconfig >= 2.11 will enjoy
this feature.