Clean look of Timeline

Align everything to the left, add colors to user names, remove some
hardcoded value in favor of Kirigami.Theme and Kirigami.Units.

imports/Spectral/Component/Timeline/TextDelegate.qml

@@ -5,16 +5,8 @@ import org.kde.kirigami 2.4 as Kirigami
 Text {
     text: "<style>pre {white-space: pre-wrap} a{color: " + Kirigami.Theme.linkColor + ";} .user-pill{}</style>" + display
 
-    font {
-        family: Kirigami.Theme.defaultFont.family
-    }
+    font.family: Kirigami.Theme.defaultFont.family + ", emoji"
 
-    color: Kirigami.Theme.textColor
-//    selectionColor: Kirigami.Theme.highlightColor
-//    selectedTextColor: Kirigami.Theme.highlightedTextColor
-
-//    selectByMouse: true
-//    readOnly: true
     wrapMode: Text.WordWrap
     width: parent.width
     textFormat: Text.RichText