Issue #2483295 by dsnopek, humansky, mglaman, cboyden: Title in FPP is double encoded when making a link

Issue #2477469 by dsnopek, mglaman: Style settings form breaks 'managed_file' elements, puts 'Cancel' button in 'General Settings' fieldset, and gives PHP notices on region style settings

Fixed notice thrown the first time a Fieldset is appended in panels_preview_process_panels_add_content_modal().

clear up confusion around shared submit functions for ctools content type and views content, move views content form alter into separate include