feat: Add keyboard shortcuts to jump to the prev/next differences in diff view (#2445)

Adds keyboard shortcuts (currently `n` and `N`) in the diffing plugin
view to jump to the next/prev difference in the list.

IMPORTANT NOTE: Depends on changes made in a library submodule. [This
PR](https://github.com/WerWolv/libwolv/pull/34) must be accepted first.

---------

Co-authored-by: Nik <werwolv98@gmail.com>

plugins/diffing/include/content/views/view_diff.hpp

@@ -36,6 +36,8 @@ namespace hex::plugin::diffing {
         std::function<std::optional<color_t>(u64, const u8*, size_t)> createCompareFunction(size_t otherIndex) const;
         void analyze(prv::Provider *providerA, prv::Provider *providerB);
 
+        void registerMenuItems();
+
         void reset();
 
     private:
@@ -45,6 +47,9 @@ namespace hex::plugin::diffing {
         std::atomic<bool> m_analyzed = false;
         std::atomic<bool> m_analysisInterrupted = false;
         ContentRegistry::Diffing::Algorithm *m_algorithm = nullptr;
+
+        u64 m_selectedAddress  = 0;
+        prv::Provider *m_selectedProvider = nullptr;
     };
 
-}
+}