Add a new command to auto-generate database table names

[madmatt]

This could either be a new command, or added on to the upgrade command. For any class that is a descendent of DataObject, automatically add private static $table_name = '<short class name>'; to the top of the class definition.

Seems straightforward enough, and would save a decent chunk of time having to open every PHP file in a project and make a trivial change.

[phptek]

+100 for this. I spoke to @robbieaverill a few days ago about this on Slack. I still don't understand why a default for $table_name in framewokr itself, wasn't implemented as just using the current class' short name - ostensibly zero difference for devlopers and the database itself when upgrading from 2/3 to 4.

[sunnysideup]

I reckon by default the table name should be the short class name with the ability of using table_name to override it....

[maxime-rainville]

Duplicate of #104