Fixes cron crash due to prepared statements

[michael-bentz]

Adds empty array ExternalModules::query(). Closes #28

[ChemiKyle]

This arg is actually REDCap version dependent, you'll want to bump the redcap-version-min in config.json to avoid downloads of this module on incompatible systems. Unfortunately, easy access to which REDCap version introduced the need for a parameter array disappeared when the External Modules repo went private.

[michael-bentz]

Even though https://community.projectredcap.org/articles/76538/prepared-statements-parameterized-query-supportreq.html describes prepared statements being enforced in REDCap 9.7.8 with framework version 4, the code to enforce prepared statements already exists in REDCap 9.6.2.

The changes to provide empty arrays is supported by REDCap >= 9.5.0. See query signature summary below.

query() signature summary

REDCap Version	query() signature	prepared statement enforcement
9.4	public static function query($sql)	N/A
9.5	public static function query($sql, $parameterValues = null, $retriesLeft = 2)	N/A
9.6.2	public static function query($sql, $parameters = null, $retriesLeft = 2)	if($parameters === null){ throw new Exception(ExternalModules::tt('em_errors_117')); }

[ChemiKyle]

The root of this issue (and my mischaracterization of it) was the use of ExternalModules::query rather than $this->framework->query. The former is not likely to be accepted to the repo.