Fix usermod library builds

Manage include folders via a second platformio script, fixing builds and
removing all the extra boilerplate from usermod library.json files.

usermods/audioreactive/library.json

@@ -1,8 +1,6 @@
 {
   "name": "audioreactive",
   "build": {
-    "srcDir": ".",
-    "includeDir": "../../wled00",
     "extraScript": "override_sqrt.py"
   },
   "dependencies": [

usermods/usermod_v2_animartrix/library.json

@@ -1,11 +1,5 @@
 {
   "name": "animartrix",
-  "build": {
-    "srcDir": ".",
-    "includeDir": "../../wled00",
-    "libLDFMode": "chain+",
-    "libArchive": false
-  },
   "dependencies": {
     "Animartrix": "https://github.com/netmindz/animartrix.git#b172586"
   }    

usermods/usermod_v2_auto_save/library.json

@@ -1,8 +1,3 @@
 {
-  "name": "auto_save",
-  "build": {
-    "srcDir": ".",
-    "includeDir": "../../wled00",
-    "libLDFMode": "chain+"
-  }
+  "name": "auto_save"
 }