* Add customIcon and customIconColor properties to ContextMenuAction
* Convert the new ContextMenuAction properties
* Set customIcon with customIconColor, if available, for the ContextMenu actions
* Add type declarations for new props
* Update README with new action props, fix other typos
* Add example for new action props
* Update readme and specify the higher priority of customIcon
* Refactor icon and iconColor props on iOS native side
* Remove "system" prefix from icon and iconColor on Android native side
* Update type declarations with new the new prop changes
* Update and format README
* Call processColor for iOS in index.js
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