Fixed external sources of images/video contents in Image, VideoPlayer…#435

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batzkass wants to merge 3 commits intorawpython:apache_base_urlfrom

batzkass:url_root

Commits on Feb 15, 2021

Fixed external sources of images/video contents in Image, VideoPlayer and SvgImage widgets.
batzkass
committed

Commits on Feb 16, 2021

Fix retro-compatibility scripts (declare url_root in gui.py).
batzkass
committed

Commits on Mar 19, 2021

Fix file uploader url.
batzkass
authored