Omit command line parsing

The purpose of this patch is to speed up startup process of KMyMoney.

Changes:

1. Only mandatory informations about application are set each time it

starts.

2. Additional informations have been moved to kcreditswindow.cpp from

which they can be fetched on request.

3. Command line is processed only if there is at least one argument

passed.

4. "About KMyMoney" has been reconnected and shows about data only on

request.

Differential Revision: https://phabricator.kde.org/D6423

Signed-off-by: Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>