[CIUv3] Custom Installer Ultimate v3

[Cesar82]

Added hotfix 3 to beta 7 in #post.

New DiskSpan BAT
I attached a new DiskSpan BAT file with some additional settings for use with the DUAL installer.
The new settings are:

set INSTALLERTYPE=STEAM,GOG,UWP
set ISCIU3001=TRUE

- The ISCIU3001 setting is for you to use with CIU 3.0.0.0.u9 just by setting the value FALSE
- The definition of the variable INSTALLERTYPE supports combinations STEAM, GOG, UWP separated by commas, or just one of them if you prefer.
It is possible to use 2 bat one for each type like "_DiskSpan_STEAM.bat" and "_DiskSpan_GOG.bat" just by defining the type for each one.
If you have more than one type of options, the user will be offered the option to choose.
For normal installers just disable this INSTALLERTYPE line using "::" or "rem" (without quotes) at the beginning of the line.
With these settings, the bat file automatically creates the settings highlighted in the image below.