Allow template type per template

[jayvdb]

Currently template_type can only appear at:

configuration:
  template_type: ...
  ...

While that default is ok, it should be possible to override it per template.
e.g.

targets:
  - output: LICENSE
    template: license.mako
    template_type: mako

[chfw]

No, the syntax won't change. For example, for mako, they will be:

targets:
  - LICENSE: license.mako
  - output: setup.py
    template: setup.py.mako
    configuration: config.yml

No changes to jinja based syntax.

of course, it will have a dependency: moban-mako exists and is installed in current python environment.

[chfw]

I am cleaning my to-do list so closing issues that are to be delivered.