Coding style and naming in AkRanges library
Summary:
Fix coding style to follow what we use everywhere else and make the code
more legible. Also rename InContainer to RangeLike to better distinguish
between templates that only accept containers and templates that accept
Range or a container.
No change in functionality.
Reviewers: KDE PIM, vkrause
Reviewed By: KDE PIM, vkrause
Subscribers: kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D21453