How to enable native frame with custom caption color and rounded corners on windows 11 installations?

On Windows 11, Advanced Installer has native support for custom frame, frame shadow, rounded corners and border frame color when using App Installer Theme.

To enable these features on other themes:

- set AI_CF_FRAME_BASE_COLOR for caption color

- only if the theme uses Custom Frame: disable custom frame by setting AI_CF_TYPE to 0