RU 5.03 beta for DOS and UEFI

There are some bugs fixed for DOS and UEFI version.  But I did not fully test it.  Thanks for all users reported problems to me.

1. Fixed when RU /l failed, next run color will be wrong.
2. Fixed command line "/x" is not working. 
3. Fixed DOS RU did not load the previous configuration (RU.SET)
4. Fixed the last entry of ACPI XSDT table is missing.
5. Adjust BW color to make it look right.
6. Fixed CTRL-ALT-END not working, problem existed since v4.38.

Get RU 5.03 here.