fix more warnings; add to CI; suppress some warnings

src/mesh/MemoryPool.h

@@ -99,7 +99,7 @@ template <class T> class MemoryPool : public Allocator<T>
     ~MemoryPool() { delete[] buf; }
 
     /// Return a buffer for use by others
-    virtual void release(T *p)
+    void release(T *p)
     {
         assert(p >= buf &&
                (size_t)(p - buf) <

src/mesh/PhoneAPI.h

@@ -58,7 +58,7 @@ class PhoneAPI
 
     // Call this when the client drops the connection, resets the state to STATE_SEND_NOTHING
     // Unregisters our observer.  A closed connection **can** be reopened by calling init again.
-    virtual void close();
+    void close();
 
     /**
      * Handle a ToRadio protobuf

src/mesh/http/ContentHandler.h

@@ -36,7 +36,7 @@ class HttpAPI : public PhoneAPI
   protected:
   
     /// Check the current underlying physical link to see if the client is currently connected
-    virtual bool checkIsConnected() { return true; } // FIXME, be smarter about this
+    virtual bool checkIsConnected() override { return true; } // FIXME, be smarter about this
 };
 
 

src/mesh/wifi/WiFiServerAPI.h

@@ -18,7 +18,7 @@ class WiFiServerAPI : public StreamAPI
     virtual ~WiFiServerAPI();
 
     /// override close to also shutdown the TCP link
-    virtual void close() override;
+    virtual void close();
 
   protected:
     /// We override this method to prevent publishing EVENT_SERIAL_CONNECTED/DISCONNECTED for wifi links (we want the board to