Board ID as build flag (#8634)

* Board ID as build flag

When using IDE or `arduino-cli board list`, show full board name and FQBN
```
$ arduino-cli.exe board list
Port          Protocol Type              Board Name                FQBN                       Core
xxx.xxx.x.xxx network  Network Port      LOLIN(WEMOS) D1 R2 & mini esp8266com:esp8266:d1_mini esp8266com:esp8266
```
Also add `description` field to the mDNS response containing the
original `{build.board}` string value.

resolve #7759

* does not work with recent ide (?)

* fixup! does not work with recent ide (?)

libraries/ESP8266mDNS/src/LEAmDNS.cpp

@@ -31,6 +31,11 @@
 #include <lwip/igmp.h>
 #include <lwip/prot/dns.h>
 
+// should be defined at build time
+#ifndef ARDUINO_BOARD_ID
+#define ARDUINO_BOARD_ID "generic"
+#endif
+
 namespace esp8266
 {
 
@@ -40,16 +45,6 @@ namespace esp8266
 namespace MDNSImplementation
 {
 
-/**
-    STRINGIZE
-*/
-#ifndef STRINGIZE
-#define STRINGIZE(x) #x
-#endif
-#ifndef STRINGIZE_VALUE_OF
-#define STRINGIZE_VALUE_OF(x) STRINGIZE(x)
-#endif
-
     /**
         INTERFACE
     */
@@ -1258,7 +1253,7 @@ namespace MDNSImplementation
         {
             if ((!addServiceTxt(hService, "tcp_check", "no"))
                 || (!addServiceTxt(hService, "ssh_upload", "no"))
-                || (!addServiceTxt(hService, "board", STRINGIZE_VALUE_OF(ARDUINO_BOARD)))
+                || (!addServiceTxt(hService, "board", ARDUINO_BOARD_ID))
                 || (!addServiceTxt(hService, "auth_upload", (p_bAuthUpload) ? "yes" : "no")))
             {
                 removeService(hService);

libraries/ESP8266mDNS/src/LEAmDNS.h

@@ -132,11 +132,6 @@ namespace esp8266
 namespace MDNSImplementation
 {
 
-// this should be defined at build time
-#ifndef ARDUINO_BOARD
-#define ARDUINO_BOARD "generic"
-#endif
-
 #define MDNS_IP4_SUPPORT
 #if LWIP_IPV6
 //#define MDNS_IP6_SUPPORT