Comment support about xo HOT 4 CLOSED

I have partial support that is nowhere near completed for PostgreSQL. However, any implementation I would like for multiple databases to be supported. I don't know if Oracle/MSSQL support comments, but I believe MySQL does. Additionally, for SQLite, I'd like to extract comments from the schema if possible (likely using regular expressions or some such).

My original thought was that I was going to use the comments on tables/columns/etc. as a way to hold metadata for schema directives to xo, but realize this may not be elegant/confusing.

I'm more than happy to consider any pull request that is well written, so please send one if you have it.

A quick overview of what would need to be done:
Fields would need to be added to the different template struct types in internal/types.go. It's there that you should add a Comment string member to the struct (if not already defined), and then modify the files in templates/ to support/output those. Additionally, you'll need to modify various database support files in loaders/ to extract the comments for the types. Lastly, you'll need to add the call in xo.go and modify the logic in internal/loader.go to support the changed loader code.

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I have two, potentially conflicting, use cases for this.

1. Specify capitalization, so my alllowercase tablenames and functionnames are correctly CamelCased.
2. Have the comments inserted as comments, so my database comments propagate to my godoc documentation.

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@kenshaw are camel case columns not supported?

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@olegsu camel case columns should be supported. Is there a reason you're adding this on a very old and closed ticket?

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