Enable Exporting and Importing of Logs

[nandorsoma]

Make it possible to export to the log engine. This should be easy and should be done similarly to exporting to a logger.

The import part is tricky because the module loading happens before parsing the import statement.

This is how it should look like in sqrl:

EXPORT MyStateTable To log.MyStateTableAsStream:

IMPORT MyStateTableAsStream;

[henneberger]

Duplicate of #731