Refactor initial load of application

With the advent of pre-merged and minified configuration files in #363,
Arethusa's event on initial can be extremely simplified.

This commit is basically only deleting code - all this added complexity
of asynchronous resolving of configuration files can just go away now.
Merge pull request #365 from latin-language-toolkit/refactor_configurator_and_main_ctrl

Refactor initial load of application