Dialer: Replace com.google.common.base.Optional with java type

* Recommended by AS
* Remove the Guava warning where applicable
* Also reduce the size of the LatinSmartDialMap by collapsing the
  various cases using a variation of the python script
* We also get two characters more out of it: 'Ƞ' and 'ȡ' - these look
  valid so keep them

Change-Id: I4de142a6eeb99320b3859adbd868a9db51319693