New plugin activation option: make callable and parameter to activate during initialisation

[danwos]

We could make a plugin-instance directly callable, which should have the same result as calling the activate() routine. So this is somehow a shortcut.

class MyPlugin(GwBasePattern):
    ...
    def activate():
        pass

plugin = MyPlugin()
plugin.activate()
# or
plugin()

We could do this by using __call__ inside GwBasePattern:

class GwBasePattern:
    def __cal__(self, *args, **kwargs):
        self.activate(*args, **kwargs)

Another idea to automatically activate plugins during initialisation:

plugin = MyPlugin(activate=True)

The GwBasePattern would check this during __init__:

class GwBasePattern:
    def __init__(self, *args, **kwargs):
        if "activate" in kwargs.keys() and kwargs["activate"] is True:
           self.activate()

Maybe there could also be an config-option, to activate plugins during initialisation automatically.
But I'm not sure, for which plugins __init__ gets called currently (only by user, all registered plugin, ... ).
Must check is in the pluginmananger.py.