Split settings into seperate source and header files

This also cleans up settings a bit

build/android/jni/Android.mk

@@ -206,7 +206,8 @@ LOCAL_SRC_FILES :=                                \
 		jni/src/util/string.cpp                   \
 		jni/src/util/timetaker.cpp                \
 		jni/src/touchscreengui.cpp                \
- 		jni/src/database-leveldb.cpp
+ 		jni/src/database-leveldb.cpp              \
+ 		jni/src/settings.cpp
 
 # lua api
 LOCAL_SRC_FILES +=                                \