T9: autocorrection of mistyped keys

[wildeh]

T9 mode should have similar prediction logic as the full keyboard mode has. If you type a word that Smart keyboard doesn't find in dictionary it should try to auto-correct some keypresses and look again for the words in the dictionary. For example I keep hitting the upper corner of 5 instead of 2 and would appreciate that instead of suggesting some nonesense word, smart keyboard would try autocorrecting the keypress on the edge of key 5 and see if it finds anything proper.