- Move TypeConversion from namespace esp8266 to namespace experimental. (#7252)

- Add using namespace experimental::crypto; to HelloCrypto.ino.

- Add mention about new random function in libraries.rst.

- Update keywords.

Co-authored-by: Anders <andlo151@student.liu.se>

cores/esp8266/Crypto.cpp

@@ -29,7 +29,7 @@
 
 #include <assert.h>
 
-namespace TypeCast = esp8266::TypeConversion;
+namespace TypeCast = experimental::TypeConversion;
 
 namespace
 {

cores/esp8266/Esp.cpp

@@ -542,7 +542,7 @@ uint8_t *EspClass::random(uint8_t *resultArray, const size_t outputSizeBytes) co
    * It should be noted that the ESP8266 has no Bluetooth functionality, so turning the WiFi off is likely to cause RANDOM_REG32 to use pseudo-random numbers.
    * 
    * It is possible that yield() must be called on the ESP8266 to properly feed the hardware random number generator new bits, since there is only one processor core available. 
-   * However, no feeding requirements are mentioned in the ESP32 documentation, and using yield() could possibly cause extended delays during nonce generation.
+   * However, no feeding requirements are mentioned in the ESP32 documentation, and using yield() could possibly cause extended delays during number generation.
    * Thus only delayMicroseconds() is used below.
    */ 
 

cores/esp8266/TypeConversion.cpp

@@ -26,7 +26,7 @@
 #include <assert.h>
 #include "TypeConversion.h"
 
-namespace esp8266
+namespace experimental
 {
 namespace TypeConversion
 {

cores/esp8266/TypeConversion.h

@@ -28,7 +28,7 @@
 
 #include <Arduino.h>
 
-namespace esp8266
+namespace experimental
 {
 namespace TypeConversion
 {