merge v1.0.0 into master

[bxparks]

• 1.0 (2021-09-30)
  • Add epoxy_argc and epoxy_argv as extern global variables which
    are set to the argc and argv parameters passed into the global
    main().
    • Allows command line arguments to be passed into an Arduino
      application, to facilitate debugging on a Unix desktop machine.
    • Add examples/CommandLine which provides a basic command line parser
      that can be copied and modified for other applications.
  • Add toString() to IPAddress class, activated with EPOXY_CORE_ESP8266
    for compatibility with ESP8266 Core.
  • Add strstr_P() to pgmspace.h.
  • Finally fix Issue #2 and
    Issue #25.