RFR: JDK-8306490: Fix raw type warnings in graphics

[John Hendrikx]

Focused only on raw type problems, and removing casts that were no longer needed because of the changes.

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Commit messages:
 - Fix raw type warnings in graphics project

Changes: https://git.openjdk.org/jfx/pull/1095/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1095&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306490
  Stats: 1245 lines in 184 files changed: 104 ins; 173 del; 968 mod
  Patch: https://git.openjdk.org/jfx/pull/1095.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1095/head:pull/1095

PR: https://git.openjdk.org/jfx/pull/1095