#543 Add access to sqlite3_load_extension in ooSQLite

[Mark Miesfeld]

The SQLite3 API sqlite3_load_extension allows the loading of an extension library written in C.

Although many Rexx programmers might not be able to write the extension library, many others are capable of writing one.

ooSQLite should have a way of taking advantage of this SQLite API.

[Mark Miesfeld]

Committed revision 9175. [r9175] basic implementation.