Creating the FitsTools Panel and Histogram Fixes
Summary:
Creating the FitsTools Panel on the left side of the FITSViewer to contain the Histogram, the FITSHeader, and the Statistics.
In the future, this will be a good location for parameters for liveStacking and possibly a recent tab too.
Also fixed some bugs in the Histogram and made the histogram more responsive.
Reviewers: mutlaqja
Reviewed By: mutlaqja
Subscribers: yurchor, kde-edu
Tags: KDE Edu
Differential Revision: https://phabricator.kde.org/D17147