Rewrite MakeOTF.py

[miguelsousa]

After going thru the process of doing some light cleanup to MakeOTF.py it became very clear to me that this script is in dire need of a rewrite. The main goals of this rewrite are:

• Streamline the script to 50% LOC or less
• Support Python 3.x (in addition to 2.7)
• Implement tests
• Use argparse
• Use logging (instead of print)

The way I'd like to go about it is to start from scratch a script named makeotf_new.py and build it gradually. Once this script has feature-parity with MakeOTF.py it will be renamed and replace the old one. I will define the first milestone for us to work on.

[kenlunde]

Another goal of this rewrite should be to integrate the latest-and-greatest subroutinizer in tx that takes seconds or minutes to subroutinize large CJK fonts, instead of the current hours or days.

[miguelsousa]

@kenlunde that sounds like a different goal. MakeOTF.py is just a wrapper for makeotfexe. I think that you should open a separate issue to get that enhancement into makeotfexe.

[cjchapman]

I suggest:

• replace uses of eval() with cleaner/clearer alternatives
• replace uses of exec() with cleaner/clearer alternatives
• specify expected exception types (i.e. no bare except statements)

[miguelsousa]

@cjchapman I agree with those. My expectation is that by rewriting it from scratch we'll use cleaner/clearer alternatives from the start.

[miguelsousa]

Address #280 #281 #282

[miguelsousa]

Enough has happened to makeotf.py since that it makes more sense to keep improving it.
Two of the original goals (Py3 and tests) have been addressed, and there's #861 to track the shifting to argparse and logging.