Core: remove the m_ prefix from position, the collection data controller and the themes callback - #35950

Core: remove the m_ prefix from position, the collection data controller and the themes callback#35950

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pharret31:5382-coremisc-remove-m_-prefix-position-data-controller-themes-callback-26_1pharret31/DevExtreme:5382-coremisc-remove-m_-prefix-position-data-controller-themes-callback-26_1Copy head branch name to clipboard