Broken Import: handle strings with double quotes and strings with single-quote/comma

[rhodges]

single quotes are escaped with another single quote: "he'll" becomes "he''ll"

If that single quote (or apostrophe) is right before a comma, that breaks the current regex pattern:
eg_match = r'(E'".+?(?!\)"'|E'.*?(?!\)'|.+?)(?:,\s|$)'
import_sql near line 180

It also fails on strings with double quotes, which switch from:
E'I'm a string!'
to
E'I'm a "string"!'
so that it can be single quoted

[rhodges]

gave all str() functions "or ''" so 'NoneType' was never returned. Trying to str that was breaking everything.

[rhodges]

Here's an example to test against:
'E'There were things at place, (999) xx''x xx''xxx''x''9,'', "thing preposition verbed," but thing2 stuff, "new statement."', E'0', E'0', E'0''
should parse to [(string), "E'0'", E'0'", E'0'"] (len: 4)