Upgrade to run via ArcGIS Pro Python Environment (64 bit, Python 3.x)

[stdavis]

Description of Changes

This pull request includes all upgrades required to run forklift via Pro. (proenv or propy).

It also includes some additional tuning and a bug fix (aac73c0).

I haven't been able to get tox to work with the pro conda environment. Open to suggestions.

Currently waiting on schema lock resolution for pro... Switched to using an UpdateCursor.

Note: This will require running scorched-earth since we switching to xxh64 and increasing the size of the hash field from 8 to 16 characters.

Test results and coverage

Name                    Stmts   Miss     Cover   Missing
--------------------------------------------------------
forklift\arcgis.py         65      3    95.38%   48, 96-98
forklift\cli.py           244     57    76.64%   111-112, 183-188, 195, 293-310, 317-329, 339-380
forklift\lift.py          160     26    83.75%   44-45, 163-183, 193-195, 207-209, 224, 232-234, 268, 283
forklift\messaging.py      33      1    96.97%   39
forklift\models.py        172      2    98.84%   86, 362
--------------------------------------------------------
TOTAL                     906     89    90.18%

5 files skipped due to complete coverage.
-----------------------------------------------------------------------------
154 tests run in 308.217 seconds (154 tests passed)

Speed test results

Speed Test Results
Dry Run: 3.64 minutes
Repeat: 2.29 minutes

[keatonwalker]

The changes look good to me.

[steveoh]

lgtm