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authoring space overhaul
this update tries to improve the user experience of the authoring space.

added codemirror for xml editor and script tags in colorful editor
added possibility to deactivate codemirror in author settings
added dropdown menu to insert problem templates into xml editor (thanks to tobias reinhardt)
added feature of saving current scrollposition on save when editing problems
added possibility to fold blocks in colorful editor, this state will be saved and restored
added shortcuts to create empty problems, html files and directories

and other smaller features and bugfixes

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w(){if(!o()){t.css({display:F.css("display"),width:F.outerWidth(true),height:F.outerHeight(true),"float":F.css("float")});cssOptions={position:"fixed",top:k.options.bottom==-1?s():"",bottom:k.options.bottom==-1?"":k.options.bottom,"margin-left":"0px"};if(!k.options.dontSetWidth){cssOptions.width=F.width()}F.css(cssOptions);F.addClass("scroll-to-fixed-fixed");if(k.options.className){F.addClass(k.options.className)}G="fixed"}}function b(){var I=m();var H=q;if(k.options.removeOffsets){H=0;I=I-C}cssOptions={position:"absolute",top:I,left:H,"margin-left":"0px",bottom:""};if(!k.options.dontSetWidth){cssOptions.width=F.width()}F.css(cssOptions);G="absolute"}function j(){if(!g()){e=-1;t.css("display","none");F.css({width:"",position:D,left:"",top:p.top,"margin-left":""});F.removeClass("scroll-to-fixed-fixed");if(k.options.className){F.removeClass(k.options.className)}G=null}}function v(H){if(H!=e){F.css("left",q-H);e=H}}function s(){var H=k.options.marginTop;if(!H){return 0}if(typeof(H)==="function"){return H.apply(F)}return H}function z(){if(!a.isScrollToFixed(F)){return}var J=c;if(!c){u()}var H=a(window).scrollLeft();var K=a(window).scrollTop();var I=m();if(k.options.minWidth&&a(window).width()<k.options.minWidth){if(!g()||!J){n();F.trigger("preUnfixed.ScrollToFixed");j();F.trigger("unfixed.ScrollToFixed")}}else{if(k.options.bottom==-1){if(I>0&&K>=I-s()){if(!x()||!J){n();F.trigger("preAbsolute.ScrollToFixed");b();F.trigger("unfixed.ScrollToFixed")}}else{if(K>=C-s()){if(!o()||!J){n();F.trigger("preFixed.ScrollToFixed");w();e=-1;F.trigger("fixed.ScrollToFixed")}v(H)}else{if(!g()||!J){n();F.trigger("preUnfixed.ScrollToFixed");j();F.trigger("unfixed.ScrollToFixed")}}}}else{if(I>0){if(K+a(window).height()-F.outerHeight(true)>=I-(s()||-l())){if(o()){n();F.trigger("preUnfixed.ScrollToFixed");if(D==="absolute"){b()}else{j()}F.trigger("unfixed.ScrollToFixed")}}else{if(!o()){n();F.trigger("preFixed.ScrollToFixed");w()}v(H);F.trigger("fixed.ScrollToFixed")}}else{v(H)}}}}function l(){if(!k.options.bottom){return 0}return k.options.bottom}function n(){var H=F.css("position");if(H=="absolute"){F.trigger("postAbsolute.ScrollToFixed")}else{if(H=="fixed"){F.trigger("postFixed.ScrollToFixed")}else{F.trigger("postUnfixed.ScrollToFixed")}}}var B=function(H){if(F.is(":visible")){c=false;z()}};var E=function(H){z()};var A=function(){var I=document.body;if(document.createElement&&I&&I.appendChild&&I.removeChild){var K=document.createElement("div");if(!K.getBoundingClientRect){return null}K.innerHTML="x";K.style.cssText="position:fixed;top:100px;";I.appendChild(K);var L=I.style.height,M=I.scrollTop;I.style.height="3000px";I.scrollTop=500;var H=K.getBoundingClientRect().top;I.style.height=L;var J=(H===100);I.removeChild(K);I.scrollTop=M;return J}return null};var r=function(H){H=H||window.event;if(H.preventDefault){H.preventDefault()}H.returnValue=false};k.init=function(){k.options=a.extend({},a.ScrollToFixed.defaultOptions,h);k.$el.css("z-index",k.options.zIndex);t=a("<div 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this.each(function(){(new a.ScrollToFixed(this,b))})}})(jQuery);