Temperature Object Improvements

Summary:

• Initialize our temp variables.
• Current Temps require a .
• Use Static Consts
• Use R"(....)" to reduce need to handle special chars in regex.

Reduces the chance of a return containing T: or B: at the end of a word such as "PRINT JOB:1" being treated as the current temperature.

Reviewers: patrickelectric, laysrodrigues, tcanabrava

Reviewed By: patrickelectric, tcanabrava

Subscribers: Atelier: AtCore

Tags: Atelier: AtCore

Differential Revision: https://phabricator.kde.org/D16976