RFR: 8264137: Suppress deprecation and removal warnings of internal methods [v2]

[Ajit Ghaisas]

> This PR suppresses -PLINT="removal" warnings and fixes -PLINT="deprecation" warnings. I have created separate commits for each type of warnings for the ease of review.
> 
> `gradle --info -PLINT="deprecation,removal"` -- results in warnings during build without this PR and results in no warnings with this PR.

Ajit Ghaisas has updated the pull request incrementally with two additional commits since the last revision:

 - Suppress/Fix LINT-deprecation warnings from tests
 - Suppress LINT-removal warnings from tests

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/538/files
  - new: https://git.openjdk.java.net/jfx/pull/538/files/f8dd3ae3..dcbd6169

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=538&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=538&range=00-01

  Stats: 23 lines in 11 files changed: 13 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jfx/pull/538.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/538/head:pull/538

PR: https://git.openjdk.java.net/jfx/pull/538