Cleanup account page

- Fix small padding on the right when they is not enough elements for a
  scrollbar to appear (possibly due to a kirigami regression)
- Move account editor to a seperate page
- Cleanup a bit the code style
- Add tooltip to toolbuttons

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

imports/NeoChat/Settings/Emoticons.qml

@@ -19,9 +19,10 @@ Kirigami.ScrollablePage {
     title: i18nc('@title:window', 'Custom Emojis')
 
     ListView {
+        anchors.fill: parent
+
         model: CustomEmojiModel {
             id: emojiModel
-
             connection: Controller.activeConnection
         }