### Problem description
Typing `--help` causes ImHex to exit without outputting anything.
Diagnostic messages from glib, ASan, other libraries that might have
something important to say, etc. are also suppressed.
### Implementation description
This effectively reverts 7c1e33dde6, which
was partially reverted only on Windows by code that was left commented
out in f114239f51.
Allowing other libraries to print to stderr may make the output ‘ugly’,
but lots of things print to stderr that are important for figuring out
why something is bugged, like ASan and glib.
### Additional things
### Problem description
The fonts list on Linux does not show all system fonts, and does not
show font names at all.
### Implementation description
Use Fontconfig to make the list less bad if Fontconfig headers are
available.
### Additional things
I like fonts.
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Co-authored-by: Nik <werwolv98@gmail.com>
