Refactoring AccountDiffPreference vs PatchScriptSettings+PrettySettings

There was some code duplication in these classes. This refactoring
removes the PatchScriptSettings and PrettySettings classes and uses
AccountDiffPreference instead.

Issue: bug 629
Change-Id: I57ab1522b0023503d0cbd29620236ea68b7717ed
Signed-off-by: Sasa Zivkov <zivkov@gmail.com>
15 files changed