includes/hex: Added library files

includes/hex/core.pat

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <hex/impl/imhex_check.pat>
+
+namespace hex::core {
+
+    struct Selection {
+        bool valid;
+        u64 address, size;
+    };
+
+    fn get_selection() {
+        u128 result = builtin::hex::core::get_selection();
+
+        Selection result;
+        if (result == u128(-1)) {
+            result.valid    = false;
+            result.address  = 0x00;
+            result.size     = 0x00;
+        } else {
+            result.valid    = true;
+            result.address  = result >> 64;
+            result.size     = result & u64(-1);
+        }
+
+        return result;
+    };
+
+}