"unrestricted" number of custom palettes (#4932)

- allow more than 10 custom palettes
- move palettes into CPP file
- Fix for minimizing cpal.htm (saves 2k of flash)
- shortened names in cpal, saves about 400 bytes of Flash after packing
- removed async from common.js loading to prevent errors on page loads if the file is not cached
- restricted nubmer of user palettes on ESP8266 to 10
- unrestricted number of user palettes on all other platforms (total max palettes: 256)
- added a warning when adding more than 10 palettes to let the user decide to risk it
- Bugfixes in palette enumeration, fixed AR palette adding
- AR palettes are now also added if there are more than 10 custom palettes

Co-authored-by: Blaž Kristan <blaz@kristan-sp.si>

wled00/data/settings_ui.htm

@@ -4,7 +4,7 @@
 	<meta charset="utf-8">
 	<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport">
 	<title>UI Settings</title>
-	<script src="common.js" async type="text/javascript"></script>
+	<script src="common.js" type="text/javascript"></script>
 	<script>
 	var initial_ds, initial_st, initial_su, oldUrl;
 	var sett = null;