[All] ColorMap uses RGBAColor

[fredroy]

Based on

• [Type] RGBAColor: remove inheritance from type::fixed_array and use std::array to store its components #4263

Part of the task to use std container and also just it felt dumb that ColorMap was not using the standard RGBAColor class
Mostly breaking because people needed to convert the result of ColorMap::eval() to RGBAColor

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[fredroy]

[ci-build][with-all-tests]