Improve fields creation

[wilsonfreitas]

Fields have a handler attribute that defines the variable type to parse the column.
The pass-thru generic handler is to define handler type as character.
By doing that you tell to the parser that this column has not a specific type and should reaims as a character.

fields:
- name: company
  description: Nome da companhia
  handler:
    type: character

Instead of defining a character handler a better approach is defining no handler. Like that:

fields:
- name: company
  description: Nome da companhia

Once a field has no handler it is assumed it uses a pass-thru generic handler.

This simplifies the config file and improves configuration.

[wilsonfreitas]

Done