v4.0 RC1 Fixes, Slider forms, and JS helper codes

custom js/css editors.
added 'cf7sg_dynamic_dropdown_taxonomy_query' filter.
slider forms.
multi-step forms.
added 'cf7sg_remove_table_row_labels' filter to re-instate labels in table rows.
added 'cf7sg_admin_form_editor_jstags_other_items' for plugin developer.
added 'cf7sg_admin_form_editor_jstags_last_item' for plugin developers.
enabled javascript helper codes on js editor.
added js functionality to further customise tables and tab structures.
fixed table id attributes in tabbed sections.
by-pass CF7 plugin data consolidation.