RFR: 8235772: Remove use of deprecated finalize method from PiscesRenderer and AbstractSurface

[Ambarish Rapte]

The finalize() method is deprecated in JDK9. See [Java 9 deprecated features](https://www.oracle.com/technetwork/java/javase/9-deprecated-features-3745636.html).
And so the [PiscesRenderer.finalize()](https://github.com/openjdk/jfx/blob/71ca899fbfc74d825c29b20a778d6d9eb243f90f/modules/javafx.graphics/src/main/java/com/sun/pisces/PiscesRenderer.java#L439) and [AbstractSurface.finalize()](https://github.com/openjdk/jfx/blob/71ca899fbfc74d825c29b20a778d6d9eb243f90f/modules/javafx.graphics/src/main/java/com/sun/pisces/AbstractSurface.java#L100) method should be removed.

The change is,
1. Remove finalize method from PiscesRenderer and AbstractSurface classes.
2. Use [Disposer](https://github.com/openjdk/jfx/blob/71ca899fbfc74d825c29b20a778d6d9eb243f90f/modules/javafx.graphics/src/main/java/com/sun/prism/impl/Disposer.java#L48) class for cleanup instead of finalize().  For SW pipeline the cleanup is initiated in [here](https://github.com/openjdk/jfx/blob/71ca899fbfc74d825c29b20a778d6d9eb243f90f/modules/javafx.graphics/src/main/java/com/sun/javafx/tk/quantum/UploadingPainter.java#L195) in UploadingPainer.java.
3. Added new JNI methods to JPiscesRenderer.c and JAbstractSurface.c and removed the ones which were used previously with finalize() method.

Verification:
Verified that the newly added dispose() methods get invoked as required and no OOM occurs.
1. Create a sample program which adds and removes non 3D shapes and/or controls to stage in a loop.
2. Run the program using -Dprism.order=sw,  -Dprism.verbose=true. (optional -Xmx50m)
Expected Behavior: 
a. Maximum memory consumption after this change should reduce or remain same as that of before this change.
b. No OOM should occur with this change or without this change.

-------------

Commits:
 - 31df0ebc: 8235772: Remove use of deprecated finalize method from PiscesRenderer and AbstractSurface

Changes: https://git.openjdk.java.net/jfx/pull/66/files
 Webrev: https://webrevs.openjdk.java.net/jfx/66/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8235772
  Stats: 111 lines in 5 files changed: 40 ins; 52 del; 19 mod
  Patch: https://git.openjdk.java.net/jfx/pull/66.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/66/head:pull/66

PR: https://git.openjdk.java.net/jfx/pull/66