Convert usermods from header to library

usermods/BME280_v2/BME280_v2.cpp

@@ -479,3 +479,7 @@ public:
 
 const char UsermodBME280::_name[]                      PROGMEM = "BME280/BMP280";
 const char UsermodBME280::_enabled[]                   PROGMEM = "enabled";
+
+
+static UsermodBME280 bme280_v2;
+REGISTER_USERMOD(bme280_v2);

usermods/BME280_v2/library.json

@@ -0,0 +1,9 @@
+{
+  "name:": "BME280_v2",
+  "build": {
+    "srcDir": ".",
+    "includeDir": "../../wled00",
+    "libLDFMode": "chain+",
+    "libArchive": false
+  }
+}