BUG: Fix invalid screenshoturls

Use direct link to the corresponding image instead of link of the form
`http://www.slicer.org/wiki/File:ImageName.png`.

Use `https://www.slicer.org/slicerWiki/images` URL base instead of invalid
`http://www.slicer.org/w/images`.

Use `https://www.na-mic.org/w/img_auth.php` URL base instead of invalid
`http://wiki.na-mic.org/Wiki/images`.

GyroGuide.s4ext

@@ -38,7 +38,7 @@ status Beta
 description GyroGuide determines the trajectory angle and depth of puncture path, and transmits the calculated information to the probe for real time navigation.
 
 # Space separated list of urls
-screenshoturls http://www.slicer.org/slicerWiki/index.php/File:GyroGuide-Step-2.png
+screenshoturls https://www.slicer.org/slicerWiki/images/8/80/GyroGuide-Step-2.png
 
 # 0 or 1: Define if the extension should be enabled after its installation.
 enabled 1

SPHARM-PDM.s4ext

@@ -38,7 +38,7 @@ status
 description SPHARM-PDM is a tool that computes point-based models using a parametric boundary description for the computing of Shape Analysis.
 
 # Space separated list of urls
-screenshoturls http://www.na-mic.org/Wiki/images/3/34/Spharm-pdm-snapshot.png
+screenshoturls https://www.na-mic.org/w/img_auth.php/3/34/Spharm-pdm-snapshot.png
 
 # 0 or 1: Define if the extension should be enabled after its installation.
 enabled 1

ShapePopulationViewer.s4ext

@@ -38,7 +38,7 @@ status
 description Visualize and interact with multiple surfaces at the same time to easily compare them
 
 # Space separated list of urls
-screenshoturls http://wiki.na-mic.org/Wiki/images/8/81/Screenshot1.png http://wiki.na-mic.org/Wiki/images/1/13/SPVscreenshot2.png
+screenshoturls https://www.na-mic.org/w/img_auth.php/8/81/Screenshot1.png https://www.na-mic.org/w/img_auth.php/1/13/SPVscreenshot2.png
 
 # 0 or 1: Define if the extension should be enabled after its installation.
 enabled 1

SlicerDevelopmentToolbox.s4ext

@@ -38,7 +38,7 @@ status      Work in progress
 description SlicerDevelopmentToolbox extension facilitates the development process of modules/extensions with a large variety of widgets, helpers, decorators, events, constants and mixin classes
 
 # Space separated list of urls
-screenshoturls http://www.slicer.org/wiki/File:IncomingDataWindow.png http://www.slicer.org/wiki/File:ModuleSettingsWidget.png http://www.slicer.org/wiki/File:RatingWindow.png http://www.slicer.org/wiki/File:TargetCreationWidget.png http://www.slicer.org/wiki/File:Watchbox.png
+screenshoturls https://www.slicer.org/slicerWiki/images/0/0b/IncomingDataWindow.png https://www.slicer.org/slicerWiki/images/2/22/ModuleSettingsWidget.png https://www.slicer.org/slicerWiki/images/c/c9/RatingWindow.png https://www.slicer.org/slicerWiki/images/2/2a/TargetCreationWidget.png https://www.slicer.org/slicerWiki/images/e/ea/Watchbox.png
 
 # 0 or 1: Define if the extension should be enabled after its installation.
 enabled 1

SlicerRadiomics.s4ext

@@ -38,7 +38,7 @@ status beta
 description Radiomics extension provides a 3D Slicer interface to the pyradiomics library. pyradiomics is an open-source python package for the extraction of Radiomics features from medical imaging.
 
 # Space separated list of urls
-screenshoturls http://www.slicer.org/w/images/3/3b/SlicerRadiomics-lung.png
+screenshoturls https://www.slicer.org/slicerWiki/images/3/3b/SlicerRadiomics-lung.png
 
 # 0 or 1: Define if the extension should be enabled after its installation.
 enabled 1