Update WiX XML file and instructions

[jasagredo]

The Wix instructions are outdated (candle.exe and light.exe were unified in wix.exe) and the WXS file also was outdated.

❯ wix build scryer-prolog.wxs
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs(2) : error WIX0199: The Wix element has an incorrect namespace of 'http://schemas.microsoft.com/wix/2006/wi'. Please make the Wix element look like the following: <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">.

❯ wix convert scryer-prolog.wxs
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs : information WIX0005: [Converted] This file contains an XML declaration on the first line. (DeclarationPresent)
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs(1) : information WIX0009: [Converted] The namespace 'http://schemas.microsoft.com/wix/2006/wi' is out of date. It must be 'http://wixtoolset.org/schemas/v4/wxs'. (XmlnsValueWrong)
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs(2) : information WIX0023: [Converted] Using '*' for the Product Id attribute is unnecessary. Remove the attribute to remove the redundancy. (AutoGuidUnnecessary)
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs(2) : information WIX0030: [Converted] The Product and Package elements have been renamed and reorganized for simplicity. (ProductAndPackageRenamed)
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs : information WIX0058: [Converted] The TARGETDIR directory should no longer be explicitly defined. Remove the Directory element with Id attribute 'TARGETDIR'. (TargetDirDeprecated)
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs(11) : information WIX0059: [Converted] Standard directories such as 'ProgramFilesFolder' should no longer be defined using the Directory element. Use the StandardDirectory element instead. (DefiningStandardDirectoryDeprecated)
C:\Users\Javier\scryer-prolog\scryer-prolog.wxs(18) : information WIX0059: [Converted] Standard directories such as 'ProgramMenuFolder' should no longer be defined using the Directory element. Use the StandardDirectory element instead. (DefiningStandardDirectoryDeprecated)

❯ wix build scryer-prolog.wxs

❯ ls scryer-prolog.msi -l
-rw-r--r-- 1 Javier Javier 3141632 Dec 10 23:50 scryer-prolog.msi

[jasagredo]

@aarroyoc might be interested as the original author of the file.