RFR: JDK-8297332: Remove easy warnings in base

[Nir Lisker]

On Mon, 21 Nov 2022 15:19:24 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> The main thing to be careful of is that we don't touch any public API signatures, since some of these sort of automated changes can have impact that we would need to consider.

This set of warnings doesn't change method signatures. The "raw types" warning fix will do that, so we will be careful there.

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PR: https://git.openjdk.org/jfx/pull/957