Port to 1.16.5

Kottle -> KotlinForForge

gradle.properties

@@ -6,9 +6,9 @@ jarName = BetterFoliage-Forge
 
 version = 2.6.1
 
-mcVersion = 1.15.2
-forgeVersion = 31.2.44
-mappingsChannel = snapshot
-mappingsVersion = 20200514-1.15.1
+mcVersion = 1.16.5
+forgeVersion = 36.1.17
+mappingsChannel = official
+mappingsVersion = 1.16.5
 
-kottleVersion = 1.4.0
+#kottleVersion = 1.4.0