Harmonize community contributions

[jpalawaga]

The main fork has some good/valuable contributions sitting in PR/closed status, or spread across forks.

Make an attempt at actually putting the community contributions together into a single place (ideally: without breaking anything).

[jpalawaga]

Potential other contribution: nikos06/odbc@725dab1 - Implements Type() / Length() / Nullable() / ScanType()

[jpalawaga]

Connection pooling improvements - https://github.com/awaken/odbc/commits/master

[jpalawaga]

Query timeout support - christophetrinh/odbc@6482c23

With context deadlines, too: dsmcfarl/odbc@c191d00

[jpalawaga]

Change default time support to be utc instead of local:

raceresult/odbc@a68ad22

[jpalawaga]

Last insert id: What-Color/odbc@433e9c4

[jpalawaga]

Better null types: What-Color/odbc@8efd78d

[jpalawaga]

Type enhancements (with nulls again) hugorut/odbc@f006d5d -- though maybe some interesting/contributor specific type choices.