[XB] Paid Registration 2.0.1 Patch Level 9

Fix: avoid "Cannot call method renderCancellation on non-object (null)" errors if the payment provider for the purchased upgrade is unavailable
Fix: always force account type selection if no free type available

Fix: properly check required account type selection for connected account registration

Fix: "External purchase" checkbox cannot be unchecked

Fixed clickable link on free account type price

Added option to filter purchasable upgrades
If enabled, upgrades that cannot be purchased will be hidden from the paid account types page

Fix: account type data not passed when registering using connected account providers

Code refactoring
Added missing "ozzmodz_paidreg_this_account_type_cannot_be_purchased_at_moment" phrase
Added style property to make clickable price text on standard layout