qt: Introduce PlatformStyle

Introduce a PlatformStyle to handle platform-specific customization of
the UI.

This replaces 'scicon', as well as #ifdefs to determine whether to place
icons on buttons.

The selected PlatformStyle defaults to the platform that the application
was compiled on, but can be overridden from the command line with
`-uiplatform=<x>`.

Also fixes the warning from #6328.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/qt/addressbookpage.h b/src/qt/addressbookpage.h
index 09634ce336..92e6cab9ac 100644
--- a/src/qt/addressbookpage.h
+++ b/src/qt/addressbookpage.h
@@ -9,6 +9,7 @@
 
 class AddressTableModel;
 class OptionsModel;
+class PlatformStyle;
 
 namespace Ui {
     class AddressBookPage;
@@ -39,7 +40,7 @@ public:
         ForEditing  /**< Open address book for editing */
     };
 
-    explicit AddressBookPage(Mode mode, Tabs tab, QWidget *parent);
+    explicit AddressBookPage(const PlatformStyle *platformStyle, Mode mode, Tabs tab, QWidget *parent);
     ~AddressBookPage();
 
     void setModel(AddressTableModel *model);