Change unit building strings to constants #19
Prepare and clean-up XML for Unit Mode #19

+ Expanded the unit_entries array into four separate arrays for dynamic display change
+ New "Unit mode" setting, feature complete control over exactly what unit is being used
* Auto and Manual strings now placed on their own (for sharing Auto string)
* Non-translatable string arrays moved to values.xml with references to translatable strings
- Cleaned up obsolete strings
Implement the Unit mode setting #19

+ Custom summary attached to the selected Unit mode value text
+ Using unit mode selection, the unit choices (entries) will be dynamically refreshed.
* Method name changed to reflect its expanded purpose
* Optimize refreshPreferences logic to not process too many things unnecessarily
* Reduced redundant code and increased efficiency in createText
* Changed default unit mode to 'Decimal bytes'
Merge branch 'master' of https://github.com/chiehmin/Xposed-NetworkSpeedIndicator