appendConfigData only for usermod + optimizations

- rename replaceOption to rOption
- rename removeOptions to dOptions
- set oAppend buffer size back to 3096
- WLEDMM warning on settings2D Populate
- add AppendConfig per usermod
- add request parameter to getSettinsJS
- add lookupName

wled00/data/settings_2D.htm

@@ -170,7 +170,7 @@ Y:<input id="P${i}Y" name="P${i}Y" type="number" min="0" max="256" value="0"><br
 			<option value="1">Vertical</option>
 		</select><br>
 		Serpentine: <input type="checkbox" name="PS"><br>
-		<i style="color:#fa0;">Can populate LED panel layout with pre-arranged matrix.<br>These values do not affect final layout.</i><br>
+		<i style="color:#fa0;">Can populate LED panel layout with pre-arranged matrix.<br>These values do not affect final layout.<br>WLEDMM: Populate will overwrite earlier saved panel layouts!</i><br>
 		<button type="button" onclick="gen()">Populate</button>
 		<hr class="sml">
 		<h3>Panel set-up</h3>