Add Support MicaAlt

[ghost1372]

Add Support MicaAlt Backdrop

Description

more info here

https://docs.microsoft.com/en-us/windows/apps/design/style/mica

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)