Auto add new columns and new tables to db on version increase about schematic HOT 3 CLOSED

I'd rather have a @Version annotation than have the database be committed in some format.
This is tracked in #49, but no work has been done on it.

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I saw that before opening this.
I believe version annotations on tables can be simpler to do.
I opened this because I think there can even be an automated way to do it. I will investigate further.

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Sure, it's easy enough to automatically add missing tables or columns. I'm just not sure I like adding that much magic.
Developers might expect more things to happen automatically, like adding or changing a default value. This just isn't possible without renaming the old table, creating the new table, copying data over and dropping the old table.
Rather than introducing too much behavior that isn't obvious from looking at the code I'd much rather provide annotations (e.g. @Version) and utility classes (e.g. helper methods for checking if a column exists) that makes the developers life easier.

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