Generator: Enchanced API parser/validator

[zverok]

Examples of uncovered cases:

• To specify all values, use *.
• ...A "csrf" token retrieved from action=query&meta=tokens
  • should be probably converted to "Retrieved by api.query.meta(:tokens)"
• Flags: read/write rights
• This module is deprecated in favor of action=query&meta=tokens
• Sortkey to start listing from, as returned by cmprop=sortkey. Can only be used with cmsort=sortkey.

Also would nice to:

• have a links in each module to source docs
• enchanced docs (and probably even shorter apis) for parameter-less modules, there are few.