Clean up string casts
Summary:
Compile without casting to/from ascii to avoid typical mistakes due to
implicit conversions. Fix a bunch of dubious places.
Test Plan: Things compile, tests run.
Reviewers: Plasma, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: zzag, anthonyfieroni, broulik, davidedmundson, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D14060