logcat: Allow users to set colors for different priorities.

This patch enables users to customize the colors used for
log messages of different priority levels. These settings
are available in the Android -> Logcat -> Colors preference page.

This fixes: http://code.google.com/p/android/issues/detail?id=31494

Change-Id: I9430f573f84f09d00bfe25d6e53eeccf4e338e9d
4 files changed