5.0.0

[iamacup]

• Added mergeStyle prop - by default this is false for backwards compatibility but if true, the style prop will merge with pre-defined styles instead of overwriting them
• Stopped applying text styles to Views
• Changed the unknown element to render nothing instead of some strange error component by default - can still be changed through render rules
• Remove platform enum to make it easier to override styles and render rules
• Remove some unused style definitions
• Added a key to the default topLevelMaxExceededItem value
• Reworked how the root element is rendered so it can be used to apply global styles to text etc.
• Removed some use of styles.text so that styles.text is only used on the text render rule, not elsewhere as some kind of weird text styling thing
• Swap priority of styles when rendering - applies them in order of priority parent (least) to child (most)
• Updated how text styles are applied (and updated the readme) to apply them to non-traditional text style items