Refactor ButtonLayout module components

- Rename ButtonLayout module to just Buttons

- Rename ButtonLayout into AutoDirectionLayout and move it to Base,
  it's useful not just for buttons

- Rename OtherButton into GroupButton, which is now the base of all
  other Buttons buttons

- Add generic (Positive|Middle|Negative)Button components, which are now
  the base for (Apply|Cancel)Button

src/gui/Pages/AccountSettings/Account.qml

@@ -5,7 +5,7 @@ import QtQuick.Controls 2.12
 import QtQuick.Layouts 1.12
 import "../.."
 import "../../Base"
-import "../../Base/ButtonLayout"
+import "../../Base/Buttons"
 import "../../Dialogs"
 
 HFlickableColumnPage {
@@ -64,7 +64,7 @@ HFlickableColumnPage {
     }
 
 
-    footer: ButtonLayout {
+    footer: AutoDirectionLayout {
         ApplyButton {
             id: saveButton