Add Tamil keyboard

java/res/xml-sw600dp/rows_tamil.xml

java/res/xml/kbd_tamil.xml

java/res/xml/key_styles_currency.xml

java/res/xml/keyboard_layout_set_tamil.xml

java/res/xml/method.xml

java/res/xml/rowkeys_tamil1.xml

java/res/xml/rowkeys_tamil2.xml

java/res/xml/rowkeys_tamil3.xml

java/res/xml/rows_tamil.xml

...oid/inputmethod/keyboard/internal/KeyboardTextsTable.java

...tmethod/keyboard/KeyboardLayoutSetSubtypesCountTests.java

tests/src/com/android/inputmethod/keyboard/layout/Tamil.java

...droid/inputmethod/keyboard/layout/tests/TestsTamilIN.java

...board-text/res/values-ta-rIN/donottranslate-more-keys.xml