Merge branch 'dev-v7' into 7.3.0

Conflicts:
	src/Umbraco.Core/ApplicationContext.cs
	src/Umbraco.Core/Logging/LogHelper.cs
	src/Umbraco.Web.UI.Client/src/less/login.less
	src/Umbraco.Web/Scheduling/BackgroundTaskRunner.cs

src/Umbraco.Web.UI.Client/src/less/login.less

@@ -22,9 +22,10 @@
 }
 
 .login-overlay .form {
+    position:fixed;
     display: block;
-    padding-top: 100px;
-    padding-left: 165px;
+    top: 100px;
+    left: 165px;
     width: 370px;
     text-align: right;
 }
@@ -45,6 +46,13 @@
     text-align: center;
 }
 
+@media (max-width: 565px) {
+  // Remove padding on login-form on smaller devices
+  .login-overlay .form {
+    left: inherit;
+    right:25px;
+  }
+
 #hrOr {
     height: 30px;
     text-align: center;