[Cleanup] Removed .jvm.cs files that are no longer used

They were once part of a special Java target profile, but this is no longer used today.
[Cleanup] Removed net_1_1_java*.sources files

They were once part of a special Java target profile, but this is no longer used today.
[Cleanup] Removed net_1_1_java from Makefiles

It was once part of a special Java target profile, but this is no longer used today.
[Cleanup] Removed JavaEE csproj and sln files

They were once part of a special Java target profile, but this is no longer used today.
[Cleanup] Removed files that imported Java namespaces

They were once part of a special Java target profile, but this is no longer used today.
[Cleanup] Removed TARGET_JVM

It was once part of a special Java target profile, but this is no longer used today.
Test XDocument.Changed event. Covers #18772.
Changed XObject OnChanged and OnChanging to use Owner.
When XObject.Owner is not a XElement XObject.Parent returns null and the owner would not be notified of changing and changed events.
Fixes:#18772
Revert "Merge pull request #1219 from panzone/los_partial_marking"

This reverts commit 397176d70101b9bcb7b016ad028378cadb3d302e, reversing
changes made to 33c345a945fb67d8964213dc032214ba65e55321.
Merge pull request #1200 from akoeplinger/remove-jvm

[Cleanup] Remove TARGET_JVM
Correct duplicate X509CertificateValidationMode definition error caused by enum changing assemblies between .NET 4.0 and 4.5.
Merge pull request #1240 from NoesisLabs/master

Correct duplicate X509CertificateValidationMode definition error
Update X509CertificateValidationMode.cs

Remove explicit enum values for sake of consistency with existing enum.
Merge pull request #1241 from RyanMelenaNoesis/patch-1

Update X509CertificateValidationMode.cs
Merge pull request #1237 from esdrubal/xdocument

Changed XObject OnChanged and OnChanging to use Owner.
Test XElement constructed from array with null values as object.
Covers #20151.
Fixes XContainer attempt to create a XNode from a null value.
Fixes #20151.
Merge pull request #1242 from esdrubal/xelement

Fixes XContainer attempt to create a XNode from a null value.