TextInput: added isEditable property (closes #69)
TextInput: better caret position detection (closes #410)
MetalWorksMobileTheme: embedFonts = true moved next to setting textFormat to avoid too much confusion.
Scroller: better page count and page index calculation when last page is not the same size as other pages (closes #424)
TextInput: support for prompt (closes #47)
FeathersControl: fix to setSize() to handle new restrictions for NaN
MetalWorksMobileTheme: text input prompt support and some font size tweaks
MinimalMobileTheme: TextInput prompt
AeonDesktopTheme: prompt text format
AzureMobileTheme: text input prompt format and font size tweaks
ScrollText: fixed positioning code (closes #471)