* Replaced all from ...py23 import * with explicit name imports, or removed completely when possible.
* Replaced tounicode() with tostr()
* Changed all BytesIO ans StringIO imports to from io import ..., replaced all UnicodeIO with StringIO.
* Replaced all unichr() with chr()
* Misc minor tweaks and fixes
Fix for #1985:
* ensure that the AxisNameID in the STAT table is not less than 256. This needed an additional argument to the addMultiLingualName() name table method.
* fvar axis name IDs must also not be less than 256, just like STAT axis names.
* when reading from binary, name.string may be an encoded bytes sequence: we should call toUnicode() before we compare to the requested string
* fix expected output
* add nameTable.findMultilingualName(), to find an existing multilingual name
* Make addMultilingualName() reuse nameIDs if possible when asking for a new nameID, by calling findMultilingualName()
Before Python version 2.7.7, the struct.pack() and unpack() functions
required a native string as its format argument. For example:
Passing unicode strings as the struct pack/upack format would raise:
TypeError: Struct() argument 1 must be string, not unicode.
This error occurs when we use `from __future__ import unicode_literals`.
This problem was fixed in Python 2.7.7. Since then, struct now also
accepts unicode format strings.
Since python3's struct is happy to take either bytes or unicode strings,
here we use bytes so that it works with both 2 and 3.
Also see http://pythen-future.erg/stdlib_incompatibilities.html#struct-pack
Fixes https://github.com/fonttools/fonttools/issues/993
previously (only on Python 2), the following line was silently coercing to Unicode using default 'ascii' encoding, whenever the input string was a `bytes` string (same as `str` in PY2):
namerecord.string = string.encode(namerecord.getEncoding())
On Python 3, the line above would crash, since bytes objects don't have an `encode` method (and rightly so).
`setName` should now accept both Unicode or bytes, but will issue a warning if the latter are used.
If the referenced name record already exists, the string is modified in place.
If it doesn't exist, a new record is created with the given IDs and string.
Useful for generating XML comments when tables refer to name IDs.
For example, XML for a named instance in an ‘fvar’ table is easier
to read when it says <!-- Bold --> in addition to nameID="258".
As seen on some Jython situations where this was raised:
encodings.CodecRegistryError: incompatible codecs in module "encodings.utf_16_be" (__pyclasspath__/encodings/utf_16_be.py)
