New icons for code folding for issue #2948

src/vs/editor/contrib/folding/browser/arrow-collapse-dark.svg

-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#7A7A7A" d="M6 4v8l4-4-4-4zm1 2.414l1.586 1.586-1.586 1.586v-3.172z"/></svg>
\ No newline at end of file
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+</style>
+<path class="st0" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
+<path id="XMLID_5_" class="st0" d="M12,9H9v3H7V9H4V7h3V4h2v3h3V9z"/>
+</svg>

src/vs/editor/contrib/folding/browser/arrow-collapse.svg

-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#646465" d="M6 4v8l4-4-4-4zm1 2.414l1.586 1.586-1.586 1.586v-3.172z"/></svg>
\ No newline at end of file
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+<style type="text/css">
+	.icon_x002D_vso_x002D_bg{fill:#656565;}
+</style>
+<path class="icon_x002D_vso_x002D_bg" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
+<path id="XMLID_5_" d="M12,9H9v3H7V9H4V7h3V4h2v3h3V9z"/>
+</svg>

src/vs/editor/contrib/folding/browser/arrow-expand-dark.svg

-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#7A7A7A" d="M11 10.07h-5.656l5.656-5.656v5.656z"/></svg>
\ No newline at end of file
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+</style>
+<path class="st0" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
+<path id="XMLID_5_" class="st0" d="M12,9H4V7h8V9z"/>
+</svg>

src/vs/editor/contrib/folding/browser/arrow-expand.svg

-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#646465" d="M11 10.07h-5.656l5.656-5.656v5.656z"/></svg>
\ No newline at end of file
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+<style type="text/css">
+	.icon_x002D_vso_x002D_bg{fill:#656565;}
+</style>
+<path class="icon_x002D_vso_x002D_bg" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
+<path id="XMLID_5_" d="M12,9H4V7h8V9z"/>
+</svg>