Pydbml

- Fix: Remove trailing comma in Enum SQL (58 thanks ralfschulze for reporting)

- New: support more index types. Thanks pierresouchay for the contribution.

- Fix: escaping single quotes in a column's default value. Thanks ryanproback for the contribution
- Fix: TableGroup and Project name are now safely quoted on render. Thanks ryanproback for reporting
- Fix: line breaks in column and index options are now allowed. Thanks aardjon for reporting
- Fix: table elements order is now not enforced by the parser. Thanks aardjon for reporting
- New: TableGroup now can have notes (DBML v.3.7.2)
- New: TableGroup now can have color (DBML v.3.7.4)

- New: SQL and DBML renderers can now be supplied to parser

- New: SQL and DBML rendering rewritten tow support external renderers
- New: allow unicode characters in identifiers (DBML v3.3.0)
- New: support for arbitrary table and column properties (37)

- Fix: allow pk in named indexes (thanks pierresouchay for the contribution)