AC CRC fix

syslog auto suspending when no ARP responce
optiboot env slimming
generic 2560 environment (any eth)

build-flags/build_flags_mega2560

@@ -0,0 +1,19 @@
+#-DWiz5500
+#-DMODBUS_SERIAL_PARAM=SERIAL_8E1
+-DAVR_DMXOUT_PIN=18
+-DSYSLOG_ENABLE
+#-DPID_DISABLE
+-DARDUINO_OTA_MDNS_DISABLE
+-DMDNS_ENABLE
+
+-DNO_HOMIE
+-DCSSHDC_DISABLE
+-DSPILED_DISABLE
+-DAC_DISABLE
+-DOTA
+
+
+-DRESTART_LAN_ON_MQTT_ERRORS
+-D CORS=\"*\"
+-D REDIRECTION_URL=\"http://lazyhome.ru/pwa\"
+-DOTA_PORT=80