[why]
Parsing the command line arguments has nothing to do with the actual
patching.
If we want to patch more than one font we need to separate the partching
from unrelated work.

[how]
Just do the argument processing in main() and hand the information over
to the patcher object.

[note]
No functional change. Lines copied over (almost *) 1:1.

(*) Exceptions:
self.sym_font_args is now only a local variable, as it is only used in
this one function.
The startup message is shown on ... startup (i.e. main()).

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

[why]
The extension handling is a bit out-of-place and could be handled by the
arguments handling, which simplifies the code.
Somes goes for other argument validity checks.

[how]
Put argument checks into setup_arguments().

Dropping self.extensions in favour of self.args.extensions.

No functional change.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

[why]
These operations are also not strictly patching.
When we want to handle more than one font we need to have this outside
the patch() function.

[how]
Put opening and exporting (previously in __init__() and patch() into
main() outside the patcher object.

No functional change (except the sourceFont is now closed :->)

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

[why]
Someone might want to patch a whole lot of fonts that come in a ttc.

[how]
Just open all fonts that the input file contains (1 or more) and create
a single font or collection font file.

The automatic layer detection does not work in all cases for me, so we
need to manually search for the foreground layer (usually '1').

Code inspiration taken from
powerline/fontpatcher#6

[note]
Changed output in the end to the filename (before it was the font name),
so that one can easily copy&paste or open that file.

Reported-by: Lily Ballard <lily@ballards.net>
Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

[why]
With the new TTC feature we might increase the minor number ;-)
This is not just a bugfix.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

[why]
The font flags and PPEM fix does not work with font collection files,
because it does not know how to handle them. It assumes a ttf or otf
font with the specified table structure.

The fix (for single font files) has been introduced with commit
  40138be  font-patcher: Handle lowestRecPPEM

[how]
Check if the file is of type 'ttcf', and if so fast forward to the given
single font index into the collection.

This can be rather slow...

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>