Convert mode from struct to class, add automatic initialization

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* To avoid filtering in the profile manager and to ensure that color_mode is set to MODE_COLORS_RANDOM correctly
for HW that has the mode flags

MODE_FLAG_HAS_RANDOM_COLOR | MODE_FLAG_HAS_PER_LED_COLOR

The values for speed_min, speed_max, colors_min and colors_max NEED to be initialised to allow for a saved
profile to load correctly in `ProfileManager::LoadDeviceFromListWithOptions`

Commit amended for code style by Adam Honse <calcprogrammer1@gmail.com>

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