Apsw-sqlite3mc

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Fixed parsing of icu-config flags

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Added SQLITE_LIMIT_WORKER_THREADS constant

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Updated test suite for Python 3.4 unittest garbage collection changes
(:issue:`164` :issue:`169`)

Using the recommended build option of
**--enable-all-extensions** turns on `STAT4
<https://sqlite.org/compile.html#enable_stat4>`__. Windows binaries
include this too.

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Added SQLITE_IOCAP_IMMUTABLE and SQLITE_FCNTL_WIN32_SET_HANDLE
constants.

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Added :meth:`Cursor.fetchone`

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No APSW code changes. Rebuild due to updated SQLite version.