Migrate language extensions during 0.7.0 -> 0.9.0 upgrade

[isc-tleavitt]

Running:

do ##class(%IPM.Main).UpdateLanguageExtensions()

Should be able to find and update the existing extension tags rather than adding duplicates. Right now it turns:

 ;Generated by %ZPM.PackageManager: Start
ZPM(pArgs...) Do ##class(%ZPM.PackageManager).Shell(pArgs...) Quit
 ;Generated by %ZPM.PackageManager: End

Into: ;Generated by %ZPM.PackageManager: Start ;Generated by %IPM.Main: Start ZPM(pArgs...) Do ##class(%ZPM.PackageManager).Shell(pArgs...) Quit ;Generated by %ZPM.PackageManager: End ;Generated by %IPM.Main: End