Release 2.4.1 - New HTTPClient and HTTPUpdater, bug fixes OTA, WiFi.connected(), others

• Add WiFi.getHostname() call
• Add HTTPUpdate class to pull updates from HTTP(S) (#789)
• Ensure OTA errors are sent in single UDP packet (#787)
• Fix OTA signing (#786)
• Report "no filesystem" on OTA uploads w/o a FS (#785)
• Add HTTPClient, ported from the ESP8266 (#784)
• Avoid rescanning/connecting on WiFiMulti.run (#782)
• Port ESP8266 DNSServer (#779)
• EEPROM: Add an update function (#780)
• Fix softAP config call
• Add ESP8266 compat functions for AP mode (#777)
• Report ::connected() as false when WiFi link drops (#774)
• Add simple WiFiMulti support (#771)
• Don't return from reboot (#772)
• Avoid spurious -O3 warning (#770)
• Allow selecting SPI port for SD/SDFS filesystem (#759)