added two new theme options:
SYSTEM: dynamically switches between light and dark
SYSTEM_AMOLED: dynamically switches between light and amoled
reversed workaround for amoled themed preferences
launch screen now always follows the system theme
This fixes the following bugs:
- Sort category is forgotten after lock/unlock
- The sort mode is not respected for new entries
I got a little carried away while working on this patch and also included the
following other enhancements:
- Simplify the SortCategory, Theme and ViewMode enums
- Simplify usage of string resources
- Don't call notifyDataSetChanged and runLayoutAnimation unnecessarily