Delete the function of processing AlphaImageLoader url

[lumburr]

AlphaImageLoader Filter,this topic documents a feature of Visual Filters and Transitions, which is deprecated as of Windows Internet Explorer 9.
https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/ms532969(v=vs.85)?redirectedfrom=MSDN
I think this function is no longer needed for new projects, old projects use the old version, and performance can be optimized after deletion