Change data directory to be NSLibraryDirectory instead of NSCachesDirectory
Centralize device info
Send IDFA and IDFV
Clean up compiler warnings
Default requires_arg = true
Remove unnecessary NSLog
Fix memory leak in generateUUID
Keep location in Amplitude.m
Don't release CTTelephonyNetworkInfo
Reset session id on backgroundQueue
Remove unnecessary replaceWithJSONNull method
Change some method signatures to be cleaner
Remove unused methods getPlatformString and getPhoneModel