describe class attributes

[nineinchnick]

Greatly improve the --describe command by adding class attributes docs and marking which ones are required. Also print default values.

Note: in this MR I do not try to document all attributes but only the most obvious ones

Here's the current (truncated) output of the make describe command:

TM class attributes:
  description     Model description, required
  isOrdered       Automatically order all Dataflows, default: False
  mergeResponses  Merge response edges in DFDs, default: False
  name            Model name, required
  threatsFile     JSON file with custom threats, default: /home/jwas/src/pytm/pytm/threatlib/threats.json

Element class attributes:
  OS
  definesConnectionTimeout        default: False
  description
  handlesResources                default: False
  implementsAuthenticationScheme  default: False
  implementsNonce                 default: False
  inBoundary
  inScope                         Is the element in scope of the threat model, default: True
  isAdmin                         default: False
  isHardened                      default: False
  name                            required
  onAWS                           default: False

...

Possibly closes #78

[ghost]

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