Continuum CXM #104

Various improvements and fixes

Improvement General accessibility improvements to the case messages UI

Improvement app.php front controller php code exposed to public.

Improvement mygovscot account authentication: Improvement to use svt rather than ucrn as user external identifier

Fix Fixed an issue where users would intermittently be redirected to the case dashboard.

Fix Fixed an IE10 specific issue where some content was hidden when scrolling content within a "piano" UI.

Fix Fixed an issue that made it possible to view one specific file of the PHP source code for CXM via the frontend.

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