impr: Move script library to its own library

plugins/script_loader/templates/CSharp/ImHexLibrary/UI.cs

@@ -0,0 +1,53 @@
+#pragma warning disable SYSLIB1054
+
+using System.Drawing;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace ImHex
+{
+    public class UI
+    {
+        [DllImport(Library.Name)]
+        private static extern void showMessageBoxV1([MarshalAs(UnmanagedType.LPStr)] string message);
+
+        [DllImport(Library.Name)]
+        private static extern void showInputTextBoxV1([MarshalAs(UnmanagedType.LPStr)] string title, [MarshalAs(UnmanagedType.LPStr)] string message, StringBuilder buffer, int bufferSize);
+
+        [DllImport(Library.Name)]
+        private static extern unsafe void showYesNoQuestionBoxV1([MarshalAs(UnmanagedType.LPStr)] string title, [MarshalAs(UnmanagedType.LPStr)] string message, bool* result);
+
+        public static void ShowMessageBox(string message)
+        {
+            unsafe
+            {
+                showMessageBoxV1(message);
+            }
+        }
+
+        public static bool ShowYesNoQuestionBox(string title, string message)
+        {
+            unsafe
+            {
+                bool result = false;
+                showYesNoQuestionBoxV1(title, message, &result);
+                return result;
+            }
+        }
+
+        public static string? ShowInputTextBox(string title, string message, int maxSize)
+        {
+            unsafe
+            {
+                StringBuilder buffer = new(maxSize);
+                showInputTextBoxV1(title, message, buffer, buffer.Capacity);
+
+                if (buffer.Length == 0 || buffer[0] == '\x00')
+                    return null;
+                else
+                    return buffer.ToString();
+            }
+        }
+
+    }
+}