We don't need to cast to int when using the round function from py23,
as this is a backport of python3's built-in round and thus it returns
an int when called with a single argument.
Cleans up GDEF varstore as well.
What's left:
- In none of the varLib.merger Mergers we handle the CaretValueFormat3. That should be done,
even though no one uses this,
- GPOS/GSUB FeatureVariations are not applied. Shouldn't be hard.
- 'rvrn' should be folded into 'ccmp' or some other default feature.
Towards addressing https://github.com/fonttools/fonttools/issues/1070
The new instantiateVariableFont function takes a variable TTFont and a
dictionary of axes locations and returns a static TTFont instance.
The current code modifies the varfont in-place. To adapt it for
generating multiple instances from the same varfont, for now I simply
resorted to making a copy (can be optionally disabled by setting
inplace=True).
Also, replaced print() with log.info().
When varLib was updated for avar table, this was not. Share code such
that they don't get out of sync again. All of this to be made into
proper API some time...
The convention is that sys.exit(...) is called only if a module is run as a script,
and that main() entry points use return statements to report exit codes: 0 (or None)
for successful execution, or any non-zero integer for errors.
E.g. see the console scripts generated when installing with pip.
