Implemented new C++ logic

Client/debugger/static/index.html

@@ -70,7 +70,7 @@
         <option value="10">10 s</option><option value="30">30 s</option>
         <option value="60">60 s</option>
       </select>
-      <button id="btn-cursor" class="ctrl-btn" style="display:none">Cursor</button>
+      <button id="btn-cursor" class="ctrl-btn">Cursors</button>
       <button id="btn-zoom-back" class="ctrl-btn" style="display:none">← Back</button>
       <button id="btn-zoom-fit" class="ctrl-btn">Fit</button>
       <button id="btn-csv-all" class="ctrl-btn" title="Export all signals to CSV">⬇ CSV</button>