RFR: 8342454: Remove calls to doPrivileged in javafx.graphics/com.sun.glass

[Jayathirth D V]

This PR removes AccessController.doPrivileged() calls in javafx.graphics/com.sun.glass. It is part of umbrella task [JDK-8342441](https://bugs.openjdk.org/browse/JDK-8342441).

Also wherever classes are implementing PrivilegedAction they are replaced with java.util.Supplier and get().

I have removed reference to all AccessControl** class except in `Accessible.java` assuming that AccessControlContext from this class might be needed at some other place and its better if we remove it under [JDK-8342993](https://bugs.openjdk.org/browse/JDK-8342993)

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Commit messages:
 - Remove PrivilegedAction and AccessControl imports
 - Remove doPrivileged calls

Changes: https://git.openjdk.org/jfx/pull/1624/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1624&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342454
  Stats: 436 lines in 35 files changed: 17 ins; 250 del; 169 mod
  Patch: https://git.openjdk.org/jfx/pull/1624.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1624/head:pull/1624

PR: https://git.openjdk.org/jfx/pull/1624