Change database schema

phone is stored as 11 columns now.
Add chewing-sql.c for all SQL related code
Add struct SqlStmtDesc_
Merge hash.c, plat_sqlite3 to chewing-sql.c
Update copyright
Remove hash.c and plat_sqlite3.c
Refactoring chewing-sql.c to K&R style
Add log in chewing-sql.c
Change bind and column to char to save space
Implement SQL statements in SQL_STMT_USERPHRASE
Rewrite userphrase enumerate APIs
Rewrite all SQL statements