Teach lexer to match token regexes over multiple lines

[jdpage]

• Switch from the builtin "re" module to the "regex" package
• Teach ReStream load the next section of the file automatically if it might allow a longer match.
• Tweak the gold-syntax lexer definition to take advantage of multiline token matches. This also required the addition of catchall token patterns to the string and comment modes.

[coveralls]

Pull Request Test Coverage Report for Build 374

• 62 of 78 (79.49%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.8%) to 88.235%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
jeff65/parsing.py	54	70	77.14%
<!--	Total:	62	78	79.49%	-->

Totals
Change from base Build 365:	-0.8%
Covered Lines:	1526
Relevant Lines:	1717

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 377

• 62 of 78 (79.49%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 88.235%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
jeff65/parsing.py	54	70	77.14%
<!--	Total:	62	78	79.49%	-->

Totals
Change from base Build 375:	-0.7%
Covered Lines:	1526
Relevant Lines:	1717

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 374

• 62 of 78 (79.49%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.8%) to 88.235%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
jeff65/parsing.py	54	70	77.14%
<!--	Total:	62	78	79.49%	-->

Totals
Change from base Build 365:	-0.8%
Covered Lines:	1526
Relevant Lines:	1717

---

💛 - Coveralls

[jdpage]

THANK YOU COVERALLS I HEARD YOU THE FIRST TIME