mainview: improve UI theme

- SmartList menu
- SideView/CallView separator width
- AccountComboBox
- UserProfile
- WelcomeView
- Rescale RecordBox

Change-Id: I5bb75bddcd49c5ff8b48ee9568942df015292e14
Gitlab: #574
diff --git a/src/mainview/components/MessageWebView.qml b/src/mainview/components/MessageWebView.qml
index 2045edf..1cb9242 100644
--- a/src/mainview/components/MessageWebView.qml
+++ b/src/mainview/components/MessageWebView.qml
@@ -29,7 +29,7 @@
 Rectangle {
     id: messageWebViewRect
 
-    property int messageWebViewHeaderPreferredHeight: 60
+    property int messageWebViewHeaderPreferredHeight: 64
     property string headerUserAliasLabelText: ""
     property string headerUserUserNameLabelText: ""
 
@@ -58,8 +58,6 @@
         messageWebViewHeader.resetBackToWelcomeViewButtonSource(reset)
     }
 
-    anchors.fill: parent
-
     JamiFileDialog {
         id: jamiFileDialog