Add icons and highlight.js to project

This commit includes the addition of a new toolbox icon in both .ico and .png formats, updating the resource file to reference the new icon. In addition, numerous highlight.js files and styles have been integrated into the project, enhancing syntax highlighting capabilities. Existing file references in 'out_embed/all.hpp' have been updated accordingly.Add new highlighting styles and GitHub CSS to project

Introduced two new image styles, "brown-papersq" and "pojoaque", for highlighting. Additionally, embedded GitHub's CSS files as header files in the `saucer::embedded` namespace to enhance syntax highlighting features. These changes aim to improve the visual styling and customization options for code presentation.

res/highlight/styles/a11y-light.css

@@ -0,0 +1,94 @@
+pre code.hljs {
+  display: block;
+  overflow-x: auto;
+  padding: 1em
+}
+code.hljs {
+  padding: 3px 5px
+}
+/*!
+  Theme: a11y-light
+  Author: @ericwbailey
+  Maintainer: @ericwbailey
+
+  Based on the Tomorrow Night Eighties theme: https://github.com/isagalaev/highlight.js/blob/master/src/styles/tomorrow-night-eighties.css
+*/
+.hljs {
+  background: #fefefe;
+  color: #545454
+}
+/* Comment */
+.hljs-comment,
+.hljs-quote {
+  color: #696969
+}
+/* Red */
+.hljs-variable,
+.hljs-template-variable,
+.hljs-tag,
+.hljs-name,
+.hljs-selector-id,
+.hljs-selector-class,
+.hljs-regexp,
+.hljs-deletion {
+  color: #d91e18
+}
+/* Orange */
+.hljs-number,
+.hljs-built_in,
+.hljs-literal,
+.hljs-type,
+.hljs-params,
+.hljs-meta,
+.hljs-link {
+  color: #aa5d00
+}
+/* Yellow */
+.hljs-attribute {
+  color: #aa5d00
+}
+/* Green */
+.hljs-string,
+.hljs-symbol,
+.hljs-bullet,
+.hljs-addition {
+  color: #008000
+}
+/* Blue */
+.hljs-title,
+.hljs-section {
+  color: #007faa
+}
+/* Purple */
+.hljs-keyword,
+.hljs-selector-tag {
+  color: #7928a1
+}
+.hljs-emphasis {
+  font-style: italic
+}
+.hljs-strong {
+  font-weight: bold
+}
+@media screen and (-ms-high-contrast: active) {
+  .hljs-addition,
+  .hljs-attribute,
+  .hljs-built_in,
+  .hljs-bullet,
+  .hljs-comment,
+  .hljs-link,
+  .hljs-literal,
+  .hljs-meta,
+  .hljs-number,
+  .hljs-params,
+  .hljs-string,
+  .hljs-symbol,
+  .hljs-type,
+  .hljs-quote {
+    color: highlight
+  }
+  .hljs-keyword,
+  .hljs-selector-tag {
+    font-weight: bold
+  }
+}