Add the ability to enable or disable SQLITE_IOCAP_ZERO_DAMAGE using a URI

Add the ability to enable or disable SQLITE_IOCAP_ZERO_DAMAGE using a URI
parameter for both unix and windows.  Add a file-control to query or disable
the ZERO_DAMAGE setting.  Add the -uri option to the "sqlite3" TCL command
in tclsqlite3.c.  Allow the sqlite3_uri_parameter() interface to accept a
NULL pointer for its first parameter.

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