Code Quality: Fixed multiple paddings, disabled backspace addon (#354)

* Changed paddings and size for unsubscribe button to avoid shifts

* Fix bottom paddings

* Disable backspace addon, simplify attachments logic, convert switches

* Remove redundant code from Mail Rendering page

* Replace Font Icon to Path

Wino.Mail/JS/editor.js

@@ -8,7 +8,7 @@ const joditConfig = {
     "showCharsCounter": false,
     "showWordsCounter": false,
     "showXPathInStatusbar": false,
-    "disablePlugins": "add-new-line",
+    "disablePlugins": "add-new-line,backspace",
     "showPlaceholder": false,
     "uploader": {
         "insertImageAsBase64URI": true