fix: Support `ignore` option for functions.

[DanCardin]

Fixes https://github.com/DanCardin/sqlalchemy-declarative-extensions/issues/52

Note this deprecates Views.ignore_views in favor of Views.ignore (for consistency among objects implementing the field.

[coveralls]

Pull Request Test Coverage Report for Build 8335584619

Details

• 20 of 20 (100.0%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 96.351%

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Totals
Change from base Build 7998494004:	0.05%
Covered Lines:	2427
Relevant Lines:	2510

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💛 - Coveralls