better support for BLE UART and alignment with serial blocks. (#276)

* aligning uart apis with serial

* reorganizing serial/bluetooth blocks

* Autoupdate configuration for UART. (#279)

* Autoupdate configuration for UART.

* removing serial autoupdates.

libs/core/enums.d.ts

@@ -309,6 +309,22 @@ declare namespace led {
     //% block=9600
     BaudRate9600 = 9600,
     }
+
+
+    declare enum Delimiters {
+    //% block="new line"
+    NewLine = 1,
+    //% block=","
+    Comma = 2,
+    //% block="$"
+    Dollar = 3,
+    //% block=":"
+    Colon = 4,
+    //% block="."
+    Fullstop = 5,
+    //% block="#"
+    Hash = 6,
+    }
 declare namespace serial {
 }