Pass weight/italic pair instead of style.

Typeface.NORMAL/BOLD/ITALIC/ITALIC_BOLD is used for specifying relative
from current Typeface. For example

  Typeface face = Typeface.create("serif");
  Typeface thickerFace = Typeface.create(face, Typeface.BOLD);
  Typeface moreThickerFace = Typeface.create(tickerFace, Typface.BOLD);

For the purpose of providing font information, we should use weight/italic
value instead of style in Typeface.
The Columns.STYLE field was kept for preventing runtime crash of demo
apps.

Test: Manually
Change-Id: I732e8ee04a66f61321fc0a98dbfb8fdc0a4dd7a4