Use a `[Shell]` section with `DefaultThemesOff` and `CustomDefaultThemeFile`
values, specifying respectively whether to use the classic theme or a
custom one, and the complete path to the custom .theme (or .msstyles) file.
These values are compatible with those documented in the
"MS Windows Preinstallation Reference" help file
of the Windows installation CD (DEPLOY.CAB\ref.chm)
[BOOTDATA] bootcd/unattend.inf: Use the Shell/CustomDefaultThemeFile value to specify which theme to use
Instead of messing around with a file in the source tree and risk commiting it
use cmake -DUNATTENDED_BOOTCD=yes to enable it, and use the UNATTENDED_BOOTCD_* cache variables to configure
- Make "ReactOS Server" the default product option again instead of "ReactOS Workstation".
- Write "Service Pack" info onto registry.
- Add ProductOption option to bootcd unattend.inf.
- Delete IDC_PRODUCT_SUITE and IDC_PRODUCT_TYPE controls.
CORE-17028
