MDL-40802 mod_scorm: update nav setting string
MDL-40802 mod_scorm: add setting to set custom window size below to trigger collapse TOC
MDL-40802 mod_scorm: use collapsetocwinsize setting to collapse TOC, responsive grids
MDL-40803 mod_scorm: hide file icon of  sm-treeview
MDL-40803 mod_scorm: fix trimming of nav buttons when under content
MDL-40803 mod_scorm: add css to toc title, toc tree