Import FontPickerDialog.

Source home: https://github.com/maplesyrup/maple-android/wiki/FontPickerDialog
Implement font picker button by FontPickerDialog.
Improve FontPickerDialog's UI:

Set each item in list with minHeight 100px, TextSize 20, Left and right padding. Remove blank space in dialog by remove "setView" statement
Rename class MyApplication to MyApp for shorter name.
Convert pixel value to dp or sp.
Show a number prefix in FontPickerDialog
Implement TextPlacerActivity

Note: android-crop-0.9.10.aar is update but not staged, since it is not stable.
Get return from TextPlacerActivity
Package text parameter into a class. Allow set text param by its object
Implement of LockPaper selector
Bug fix: Selected area error when changing font typeface in text placer.
Add method: "getSelectedFontName" in FontPickerDialog
Set single line in FontPickerDialog.
Show font name in font picker button in TextPlacerActivity.