Implement esp_yield() as a replacement for delay(0)

esp_yield() now also calls esp_schedule(), original esp_yield() function renamed to esp_suspend().

Don't use delay(0) in the Core internals, libraries and examples. Use yield() when the code is
supposed to be called from CONT, use esp_yield() when the code can be called from either CONT or SYS.
Clean-up esp_yield() and esp_schedule() declarations across the code and use coredecls.h instead.

Implement helper functions for libraries that were previously using esp_yield(), esp_schedule() and
esp_delay() directly to wait for certain SYS context tasks to complete. Correctly use esp_delay()
for timeouts, make sure scheduled functions have a chance to run (e.g. LwIP_Ethernet uses recurrent)

Related issues:
- #6107 - discussion about the esp_yield() and esp_delay() usage in ClientContext
- #6212 - discussion about replacing delay() with a blocking loop
- #6680 - pull request introducing LwIP-based Ethernet
- #7146 - discussion that originated UART code changes
- #7969 - proposal to remove delay(0) from the example code
- #8291 - discussion related to the run_scheduled_recurrent_functions() usage in LwIP Ethernet
- #8317 - yieldUntil() implementation, similar to the esp_delay() overload with a timeout and a 0 interval

libraries/ESP8266mDNS/src/LEAmDNS_Control.cpp

@@ -702,7 +702,7 @@ bool MDNSResponder::_parseResponse(const MDNSResponder::stcMDNS_MsgHeader& p_Msg
                 for (uint16_t qd=0; ((bDumpResult) && (qd<p_MsgHeader.m_u16QDCount)); ++qd) {
                     stcMDNS_RRQuestion  questionRR;
                     bDumpResult = _readRRQuestion(questionRR);
-                    esp_yield();
+                    esp_suspend();
                 }   // for questions
                 // Handle known answers
                 uint32_t    u32Answers = (p_MsgHeader.m_u16ANCount + p_MsgHeader.m_u16NSCount + p_MsgHeader.m_u16ARCount);
@@ -713,7 +713,7 @@ bool MDNSResponder::_parseResponse(const MDNSResponder::stcMDNS_MsgHeader& p_Msg
                         delete pRRAnswer;
                         pRRAnswer = 0;
                     }
-                    esp_yield();
+                    esp_suspend();
                 }
             );*/
         m_pUDPContext->flush();