XYZ-35: Added Support for GlobalRelay Compliance Export Format

* Added username to ChannelMemberHistory struct in anticipation of supporting GlobalRelay in Compliance Export
* Removed translation from debug output - this makes it complicated to use utils functions from tests in the enterprise repo
* Added an advanced email function that allows for greater control over message details. Updated MessageExport config to support GlobalRelay. Added attachment support to InBucket unit tests
* Moving templates in from enterprise to solve test issues
* Added export format to diagnostics
* Changed email attachment code to use FileBackend so that S3 storage is properly supported

i18n/en.json

@@ -131,10 +131,6 @@
     "id": "api.admin.upload_brand_image.too_large.app_error",
     "translation": "Unable to upload file. File is too large."
   },
-  {
-    "id": "api.api.init.parsing_templates.debug",
-    "translation": "Parsing server templates at %v"
-  },
   {
     "id": "api.api.init.parsing_templates.error",
     "translation": "Failed to parse server templates %v"
@@ -4858,6 +4854,14 @@
     "id": "model.config.is_valid.message_export.batch_size.app_error",
     "translation": "Message export job BatchSize must be a positive integer"
   },
+  {
+    "id": "model.config.is_valid.message_export.export_type.app_error",
+    "translation": "Message export job ExportFormat must be one of either 'actiance' or 'globalrelay'"
+  },
+  {
+    "id": "model.config.is_valid.message_export.global_relay_email_address.app_error",
+    "translation": "Message export job GlobalRelayEmailAddress must be set to a valid email address"
+  },
   {
     "id": "model.config.is_valid.message_export.daily_runtime.app_error",
     "translation": "Message export job DailyRuntime must be a 24-hour time stamp in the form HH:MM."
@@ -7082,6 +7086,10 @@
     "id": "utils.mail.new_client.auth.app_error",
     "translation": "Failed to authenticate on SMTP server"
   },
+  {
+    "id": "utils.mail.sendMail.attachments.write_error",
+    "translation": "Failed to write attachment to email"
+  },
   {
     "id": "utils.mail.new_client.helo.error",
     "translation": "Failed to to set the HELO to SMTP server %v"
@@ -7158,10 +7166,6 @@
     "id": "web.create_dir.error",
     "translation": "Failed to create directory watcher %v"
   },
-  {
-    "id": "web.dir_fail.error",
-    "translation": "Failed in directory watcher %v"
-  },
   {
     "id": "web.do_load_channel.error",
     "translation": "Error in getting users profile for id=%v forcing logout"
@@ -7266,18 +7270,10 @@
     "id": "web.parsing_templates.debug",
     "translation": "Parsing templates at %v"
   },
-  {
-    "id": "web.parsing_templates.error",
-    "translation": "Failed to parse templates %v"
-  },
   {
     "id": "web.post_permalink.app_error",
     "translation": "Invalid Post ID"
   },
-  {
-    "id": "web.reparse_templates.info",
-    "translation": "Re-parsing templates because of modified file %v"
-  },
   {
     "id": "web.reset_password.expired_link.app_error",
     "translation": "The password reset link has expired"