Replace pin by gpio (#631)

* replace _PIN by _GPIO

* add mention about the goal of -all binaries

* [breaking] change json key from "pin" to "gpio" for actuatorONOFF

docs/upload/troubleshoot.md

@@ -31,10 +31,10 @@ Regarding the IR led emitter you can replace it with a normal led and see if it
 
 try with D2 instead of D3
 and put
-`#define RF_RECEIVER_PIN 4 // D2 on nodemcu`
+`#define RF_RECEIVER_GPIO 4 // D2 on nodemcu`
 in config_rf.h
 instead of
-`#define RF_RECEIVER_PIN 0 // D3 on nodemcu`
+`#define RF_RECEIVER_GPIO 0 // D3 on nodemcu`
 
 ## Exception seen on serial monitor:
 Hey I got a callback