Add rollup.js bundler and terser minification

Author: opichals

index.html

@@ -209,6 +209,8 @@ <h5 class="title-bar__title">Espruino Web IDE</h5>
     <script src="EspruinoTools/libs/esprima/esprima.js"></script> <!-- needed for minify -->
     <script src="EspruinoTools/libs/esprima/esmangle.js"></script> <!-- needed for minify -->
     <script src="EspruinoTools/libs/esprima/escodegen.js"></script> <!-- needed for minify -->
+    <script src="EspruinoTools/libs/rollup/espruino-rollup.browser.js"></script> <!-- needed for rollup/terser -->
+    <script src="EspruinoTools/libs/rollup/index.js"></script> <!-- needed for rollup/terser -->
     <script src="EspruinoTools/plugins/minify.js"></script>
 
     <script src="EspruinoTools/plugins/saveOnSend.js"></script> <!-- This should come after minify -->

main.html

@@ -193,6 +193,8 @@ <h5 class="title-bar__title">Espruino Web IDE</h5>
     <script src="EspruinoTools/libs/esprima/esprima.js"></script> <!-- needed for minify -->
     <script src="EspruinoTools/libs/esprima/esmangle.js"></script> <!-- needed for minify -->
     <script src="EspruinoTools/libs/esprima/escodegen.js"></script> <!-- needed for minify -->
+    <script src="EspruinoTools/libs/rollup/espruino-rollup.browser.js"></script> <!-- needed for rollup/terser -->
+    <script src="EspruinoTools/libs/rollup/index.js"></script> <!-- needed for rollup/terser -->
     <script src="EspruinoTools/plugins/minify.js"></script>
 
     <script src="EspruinoTools/plugins/saveOnSend.js"></script> <!-- This should come after minify -->

upload.html

@@ -115,6 +115,8 @@
   <script src="EspruinoTools/libs/esprima/esprima.js"></script> <!-- needed for minify -->
   <script src="EspruinoTools/libs/esprima/esmangle.js"></script> <!-- needed for minify -->
   <script src="EspruinoTools/libs/esprima/escodegen.js"></script> <!-- needed for minify -->
+  <script src="EspruinoTools/libs/rollup/espruino-rollup.browser.js"></script> <!-- needed for rollup/terser -->
+  <script src="EspruinoTools/libs/rollup/index.js"></script> <!-- needed for rollup/terser -->
   <script src="EspruinoTools/plugins/minify.js"></script>
 
   <script src="js/plugins/fontSize.js"></script>