Disallow type names in variable names

[aik099]

Disallow type names in variable names. For example $user_object or $categories_string.

List of not allowed types (see more at http://phpdoc.org/docs/latest/guides/types.html):

• string
• int, integer
• float
• bool, boolean
• array
• resource
• null
• callable
• object
• array

Related to: #78

[aik099]

Special case would be to allow variable named $object.