Embedded license preview when uploading a package through UI (#6807)

* Simple license expression preview.

* License file display MVP.

* extra lines fix for license file display

* Proper license file label

* Style changes for license file display.

Some node-related changes that will happen sooner or later.

* License file display in uploads picked up from the past.

* Inverted the logic if the method

* feedback addressed.

* Linkified license expression display.

* Removed try/catch around license access code

* Using <p> for license expression display

src/Bootstrap/dist/js/bootstrap.js

@@ -1,6 +1,6 @@
 /*!
  * Bootstrap v3.3.7 (http://getbootstrap.com)
- * Copyright 2011-2018 Twitter, Inc.
+ * Copyright 2011-2019 Twitter, Inc.
  * Licensed under the MIT license
  */
 

src/Bootstrap/less/theme/base.less

@@ -1,5 +1,6 @@
 //== Theme Variables
 @panel-footer-color:  @navbar-inverse-color;
+@default-margin-bottom: 24px;
 
 //== Theme Definition
 html, body {
@@ -11,7 +12,7 @@ body {
   display: table;
 
   h1, h2, h3, p {
-    margin-bottom: 24px;
+    margin-bottom: @default-margin-bottom;
   }
 
   h2, h3 {

src/Bootstrap/less/theme/page-upload.less

@@ -2,4 +2,13 @@
     #browse-for-package-button {
         margin: 0;
     }
+
+    pre.license-file-contents {
+        white-space: pre-wrap;
+        word-break: normal;
+    }
+
+    .custom-license-container {
+        margin-bottom: @default-margin-bottom;
+    }
 }