Route startup preference load through adapter

src/app.cpp

@@ -29,7 +29,6 @@
 #include <Foundation/Foundation.h>
 #include "objc_utils.h"
 #endif
-#include "settings.h"
 
 App* App::I = nullptr; // singleton
 
@@ -223,7 +222,7 @@ void App::initLog()
     LOG("%s", g_version);
 
     LOG("load preferences");
-    if (!Settings::load())
+    if (!pp::panopainter::load_legacy_preferences())
         LOG("load preferences failed");
 }
 

src/legacy_preference_storage.cpp

@@ -7,6 +7,11 @@
 
 namespace pp::panopainter {
 
+bool load_legacy_preferences()
+{
+    return Settings::load();
+}
+
 bool has_legacy_preference(const char* key)
 {
     return Settings::has(key);

src/legacy_preference_storage.h

@@ -4,6 +4,7 @@
 
 namespace pp::panopainter {
 
+bool load_legacy_preferences();
 bool has_legacy_preference(const char* key);
 int legacy_integer_preference(const char* key);
 int legacy_integer_preference_or(const char* key, int default_value);