EspSoftwareSerial 8.0.1: onReceive bug fix and new namespace (#8869)

* Upcoming EspSoftwareSerial 7.0.1

* EspSoftwareSerial example: higher bitrates due to forcing half-duplex

* Adapt to SoftwareSerial's latest use of namespace.

* In EspSoftwareSerial, some renaming after review feedback.

* EspSoftwareSerial's use of a template class in order to permit users their own GPIO capabilities definitions.

* CI caught some warning.

* Stick to non-namespace EspSoftwareSerial class name for the moment.

* Delegate operator() is now nullptr-safe, good for use in ISRs.

* Pushed EspSoftwareSerial 8.0.1: Platformio picks up versions that aren't published in Github

libraries/ESP8266WiFi/examples/WiFiTelnetToSerial/WiFiTelnetToSerial.ino

@@ -31,7 +31,7 @@
     SWAP_PINS:
    0: use Serial1 for logging (legacy example)
    1: configure Hardware Serial port on RX:GPIO13 TX:GPIO15
-      and use SoftwareSerial for logging on
+      and use EspSoftwareSerial for logging on
       standard Serial pins RX:GPIO3 and TX:GPIO1
 */
 
@@ -84,11 +84,11 @@ void setup() {
 #if SWAP_PINS
   Serial.swap();
   // Hardware serial is now on RX:GPIO13 TX:GPIO15
-  // use SoftwareSerial on regular RX(3)/TX(1) for logging
+  // use EspSoftwareSerial on regular RX(3)/TX(1) for logging
   logger = new SoftwareSerial(3, 1);
   logger->begin(BAUD_LOGGER);
   logger->enableIntTx(false);
-  logger->println("\n\nUsing SoftwareSerial for logging");
+  logger->println("\n\nUsing EspSoftwareSerial for logging");
 #else
   logger->begin(BAUD_LOGGER);
   logger->println("\n\nUsing Serial1 for logging");

libraries/esp8266/examples/SerialStress/SerialStress.ino

@@ -2,7 +2,7 @@
 /*
   Serial read/write/verify/benchmark
   Using internal loopback
-  Using SoftwareSerial library for logging
+  Using EspSoftwareSerial library for logging
 
   Sketch meant for debugging only
   Released to public domain