New textblock tags for elm entry widget.

New textblock tags for elm entry widget.

This commit add the following new tags:
title, subtitle, bigger, big, small, smaller, code, comment,
string, number, brace, type, class, function, param, keyword,
preprocessor, line_added, line_removed, line_changed.

Tags has been unified in 3 new utility macros:
COMMON_TEXTBLOCK_TAGS, ENABLED_TEXTBLOCK_TAGS, and DISABLED_TEXTBLOCK_TAGS
to avoid repeating too much in the theme.

Also a new test is in: "Entry Style Default" that show all the new styles.
Docs will follow soon.