Windows build fixes:  tools/mkkconfig.bat - switch APPSDIR path to use forward slashes for kconfig-frontends. interpreters/ficl - Reorder some targets that causes GNUwin32 make to behave badly.

tools/mkkconfig.bat:  Remove quotes in echo.  These were begin Echo'ed and generating double quots in the output.

apps/examples/keypadtest: REMOVED and warehoused in the Obsoleted repository.  This was just a bad clone of apps/examples/hidkbd for a keypad driver that was removed years ago.  It also uses illegal function calls into the OS.  So it has no purpse:  It is redundant, it uses illegal interfaces, and is a test for non-existent code.

NSH library: Fix build break in nsh_command.c with IPv4/IPv6 dual stack.

Approved-by: Gregory Nutt <gnutt@nuttx.org>

apps/examples/thttpd:  Remove the netstats demo.  This depends on an illegal function call and cannot be supported.  That example could be replaced with logic that uses the procfs network entries as was done for NSH which had the same issue.  But I am too lazy to implement that

ieee802154/i8sak: Adds coordinfo command allowing you to poll various attributes related to the coordinator

Approved-by: Gregory Nutt <gnutt@nuttx.org>

ieee802154/i8sak: Adds coordinfo command allowing you to poll various attributes related to the coordinator

system/telnet: POLL must not be disabled in configuration.  Telnet client port argument is no optional.

NSH library:  Add a Telnetd command.  This is needed when network initialization is deferred.  In that case, telnet daemon cannot be started until the network is finally initialized.  The telnetd command was added just for that case:  So that the telnet daemon can be started from the NSH command line after the network is configured.

ieee802154: start of scan/beacon-enabled network

Approved-by: Gregory Nutt <gnutt@nuttx.org>

examples/udp and examples/nettest: Fix some naming collisions; examples/nettest:  Fix some build issues with two targets.

system/dhcpc:  The DHCPC renew command did not build correctly due to naming problems.  Noted by Masayuki Ishikawa,

examples/nettest: Add support for both enpoints on target boards vs. one on a target and one on the host PC.

examples/nettest: Fix client/server naming confusion; add command line option to select the server address on the target; examples/udp:  Fix naming of a configuration setting

examples/nettest: Separate out network initialization so that it may, eventually, be used by both a target server and a target client.