Readme.md: switch to SVG badge.
WebUI: Cleanup.
WebUI: only make available to global scope the functions we need to access.
Use AtlEscapeUrl/AtlUnescapeUrl to do URL encoding/decoding.

This is now available outside of ATL Server. It avoids using our incomplete URL encoding function.
Update ZenLib to v0.4.29 r458.

Conflicts:
	docs/Changelog.txt
**Compilation fails** Update MediaInfoLib to v0.7.69.

Need to fix the compilation error upstream first.