Remove foreach in KmPlot in favor of range-based loops
Summary: foreach is obsolete Test Plan: 1. Compile, install, run. 2. Create some plot (sin(x)), save it, export it, close it, load it. 3. Use equation editor. Reviewers: #kde_edu, aacid Reviewed By: aacid Subscribers: aacid, kde-edu Tags: #kde_edu Differential Revision: https://phabricator.kde.org/D24212
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