Updated database APIs.
Some functions were added, and some were renamed.
Added Primary Key considerations to Emo-Packer.
1. Added new constructor to emo::CipherHolder
2. Improved utility functions.
Renamed native closures with prefix "sq".
This rule will be applied to functions which are rewritten with Sqrat.
Enhanced the database feature with new functions correspond with regular SQL statements.
1. Renamed function, "truncate" -> "truncateTable".
2. Removed unnecessary error messages.
1. Updated Android-Template & Android-Examples with the latest library.
2. Added new example, "Executing SQL Statements", to Android-Examples.
Fixed EmoActivity class to attempt copying database file only on packed mode.
Quit binding native closures with classes as it causes memory leaks. They are bound with tables now.
Also fixed some other memory leaks as well.
Modified rest of the native closures to be bound with tables instead of classes.
Following symbols are no longer classes anymore :
"Runtime", "Event", "Stage",  "Audio", "Net", "Database", "Preference", "Stopwatch", "Physics", "Android".