Add "Aspect Ratio" and "Frame Rate" to additional video information columns

Summary:
Add options to show aspect ratio and frame rate.

BUG: 366524
FIXED-IN: 19.08.0

Test Plan: Under Control -> Additional Info -> Video, there should be options for aspect ratio and frame rate.

Reviewers: #dolphin, #kde_applications, ngraham

Reviewed By: #dolphin, #kde_applications, ngraham

Subscribers: astippich, ngraham, elvisangelaccio, kfm-devel

Tags: #dolphin

Differential Revision: https://phabricator.kde.org/D20074