gulp tasks and nunjucks templating

- reworked nearly all gulp tasks
- added html templating with nunjucks
- replaced some old html files
- started correction of scss and js files according to lint results

source/code/functions.js

@@ -1,3 +1,5 @@
+'use strict';
+
 function setup() {
 	if($('#js_tph').length && full_view_hover) {
 		// $('body').prepend("<div id=\"js_tph\" class=\"layer__hover hover_full_view_change\"></div>");

source/code/global.js

@@ -1,3 +1,5 @@
+'use strict';
+
 // DOM ready
 // ------------------------------------------------------------------------------
 $( document ).ready(function() {

source/code/variables.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var w = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
 var h = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);