Merge branch 'configurable-fps' of https://github.com/aircoookie/WLED into dev

wled00/data/settings_leds.htm

@@ -563,6 +563,7 @@ ${i+1}:
 			<option value="2">Linear (never wrap)</option>
 			<option value="3">None (not recommended)</option>
 		</select><br>
+		Target refresh rate: <input type="number" class="s" min="1" max="120" name="FR" required> FPS
     <hr style="width:260px">
     <div id="cfg">Config template: <input type="file" name="data2" accept=".json"><button type="button" class="sml" onclick="loadCfg(d.Sf.data2)">Apply</button><br></div>
     <hr>