*	Fix - Strict Standards: Non-static method Pronamic_Gateways_IDealBasic_Listener::listen() should not be called statically
*	Fix - Strict Standards: Non-static method Pronamic_Gateways_OmniKassa_Listener::listen() should not be called statically
*	Fix - Strict Standards: Non-static method Pronamic_Gateways_Icepay_Listener::listen() should not be called statically
Use order ID if not empty, otherwise use payment ID.

Fix for:
https://github.com/pronamic/wp-pronamic-ideal/commit/241838250820e475fa584a9997f90d24fed2f7ae
Updated readme.txt with Sisow tweak.
Fix - Ogone OrderStandard - Improved upgrade function to convert SHA IN and OUT pass phrases.
Updated translations, fixed Dutch translation on SHA-1 to SHA-
Improved support for Event Espresso 3.1.35.P.
Use the transient issuers, so we don't query the providers each time.
Updated readme.txt 2.07 change log with latest changes.
Tweak - Rabobank OmniKassa - Improved upgrade script to convert key version from 1.0 to 2.0.
Improved support for Ogone DirectLink.
Updated to version 2.0.7.
Merge branch 'release/2.0.7'