RFR: JDK-8298528: Clean up raw type warnings in base in bindings and collections packages [v2]

[John Hendrikx]

> Packages fixed:
> - com.sun.javafx.binding
> - com.sun.javafx.collections
> - javafx.beans
> - javafx.beans.binding
> - javafx.collections
> - javafx.collections.transformation

John Hendrikx has updated the pull request incrementally with two additional commits since the last revision:

 - Clean up expression classes repeated null checks
 - Use instanceof with pattern matching in a few spots

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Changes:
  - all: https://git.openjdk.org/jfx/pull/972/files
  - new: https://git.openjdk.org/jfx/pull/972/files/cee36600..24278e96

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=972&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=972&range=00-01

  Stats: 243 lines in 5 files changed: 3 ins; 172 del; 68 mod
  Patch: https://git.openjdk.org/jfx/pull/972.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/972/head:pull/972

PR: https://git.openjdk.org/jfx/pull/972