[0.4.15][SYSSETUP][BOOT][INBV][MSGINA][SDK] Update year to 2025 and set theme using unattend.inf

CORE-19496

All wallpapers that are not in bitmap format will not work on LiveCD. LiveCD has a read-only file system and to apply non bitmap files as wallpapers, we convert them to bitmap when selected as a temporary file. Therefore, only copy non-bitmap wallpapers to BootCD, not LiveCD. Also minor fix to README in the wallpapers folder.

This commit includes:
- Partial revert of dc1a4ae9ce [0.4.15][SYSSETUP][BOOT][WALLPAPERS] Set default theme to Mizu and add wallpapers
- 2e47094764 [SYSSETUP] Apply theming from unattend files very early on when booting the LiveCD or a new install (#7797)
ebdb7b3e4d A problem has been detected and ReactOS has been shut down to prevent damage to your time machine warp core.
- 4bc97ad145 [BOOTDATA] Arabic, Hong Kong, Singapore, come back! (#7795)

boot/bootdata/bootcd/unattend.inf

@@ -59,16 +59,12 @@ LocaleID = 409
 ; 1: ReactOS Workstation
 ProductOption = 0
 
-; enable this section to automatically launch programs
+; Enable this section to automatically launch programs
 ; after 3rd boot
-;
 ; [GuiRunOnce]
 ; %SystemRoot%\system32\cmd.exe
-; Enable the next line (+ the GuiRunOnce section) to enable the lautus theme
-; "rundll32.exe shell32.dll,Control_RunDLL desk.cpl desk,@Appearance /Action:ActivateMSTheme /file:%SYSTEMROOT%\Resources\themes\lautus\lautus.msstyles"
 
-
-; enable this section to change resolution / bpp
+; Enable this section to change resolution / bpp
 ; setting a value to 0 or skipping it will leave it unchanged
 ; [Display]
 ; BitsPerPel = 32
@@ -80,3 +76,7 @@ ProductOption = 0
 ;[Env]
 ;WINETEST_PLATFORM=reactos
 
+; Enable this section to enable the default ReactOS theme
+[Shell]
+DefaultThemesOff = no
+CustomDefaultThemeFile = "%WINDIR%\Resources\Themes\Mizu\mizu.msstyles"