CRM-50: Add Separate Sub-tabs for Contributions and Recurring Contributions

CRM-50: Add Separate Sub-tabs for Contributions and Recurring Contributions

Changed Contributions Tab template so it uses two sub-tabs within it to show
on the first tab, only the contributions table, and on the second tab, just
the recurring contributions table.

On the Recurring contributions tab, two tables are shown: active recurring
contributions vs inactive recurring contributions.

Implemented backend logic to load into the page two separate arrays with
recurring contributions, the first one with active contributions, the second
one with inactive contributions.