deleted old dhtmlx scheduler libs/stylesheets/assets. refs #2744
added dhtmlx scheduler v3.7. refs #2744
removed docs, samples and connectors. refs #2744
removed @import statement for deleted dhtmlx scheduler stylesheet.
linked in new dhtmlxscheduler stylesheets and updated image urls.
rewired paths to dhtmlx js files.
replaced calendar agenda view with weekly agenda
removed agenda view configuration.
cleaned up scheduler configuration. removed obsolete rendering hack function.
colorized offerings by session type in week agenda.
removed more agenda related date calculation code and added week_agenda support in its place
added date range recalculation conditions for week agenda view
removed obsolete stylesheet import.
set text color to black for calendar events.
removed obsolete dhx style customizations.
forced black as text color for calendar events. added red dotted border style for selected events in agenda view. added code comments.
removed obsolete rendering hack and ditched unncessary configuration.
removed styles for obsolete spacer icon.
moved calendar control positioning into stylesheet. tweaked container widths for calendar/widget sidebars.
removed inline styles.