TextInput autoCapitalize

[chrisglein]

Split out from #2136
facebook.github.io/react-native/docs/textinput.html#autocapitalize
Incomplete support in XAML. This guy is an enum:
-characters: Maps to TextBox.CharacterCasing.Upper (RS3)
-words: Not supported
-sentences: Not directly supported. TextBox.IsSpellCheckEnabled (Win8) turns on auto-capitalizing first word in a sentence (which maps to autoCapitalize.sentences) but this also turns on spell-checking. Also, MikeHill says: Some of the auto capitalization functionality in TextBox is behind the InputScope API.
-none: Supported by default

[ddalp]

RichEdit supprts all scenarios, see below tom flags, but we only expose LowerCase and UpperCase for XAML TextBox today. I will add characters support and leave this issue open to be completed after integration with lifted xaml.

•  tomSentenceCase	= 0: capitalize first letter of each sentence
  

•  tomLowerCase	= 1: change all letters to lower case
  

•  tomUpperCase	= 2: change all letters to upper case
  

•  tomTitleCase	= 3: capitalize the first letter of each word
  

•  tomToggleCase	= 4: toggle the case of each letter
  

[ddalp]

Checked in Characters support, Words and Sentences support have to wait until after we use lifted XAML.