Release notes for 2018-12-25.
Updates since 2018-05-09.

---------------
 New features:
---------------

*  Added Carl Mueller's IDIV, JDIV, ISQRT.  This was an oversight from long
   ago, and now these are added under jzintv/examples/library/.

*  Raw-bits mode for controller adaptors such as Retronic that can provide
   raw input bits from native controllers.  See PDxx_BIT_x in 
   jzintv/doc/jzintv/kbdhackfile.txt & jzintv/doc/jzintv/retronic-usb-raw.kbd.

*  Debugger features:  (see jzintv/doc/debugger.txt for updated docs)

   b?     lists active breakpoints
   t?     lists active tracepoints
   w?     lists active write-watches
   @?     lists active read-watches
   ??     outputs the debugger's current status

*  Add "button" mode to support analog joysticks that have analog buttons
   that report themselves as analog axes.

*  Add support for saving/loading ECS cassettes and printing to the ECS printer.

----------
 Changes:
----------

*  Updated the NTSC and PAL palettes based on experiments with TV capture
   cards and eyeballing several games.  (Congo Bongo is a tough one to nail.)
   Also, NTSC and PAL now have different palettes.

*  macOS builds are now 64-bit only, driven by recent changes in macOS.
   jzIntv should still run with OSX 10.7.x or later.

*  A raw semicolon ';' in a kbdhackfile now introduces a comment.  To bind
   the semicolon event, use the word SEMICOLON.

-------------------------
 Cleanups and bug fixes:
-------------------------

*  Fix "voice_compat" in internal ROM database.  It accidentally requested
   ECS rather than Intellivoice for known voice games.

*  Myriad fixes to allow compiling with MSVC, along with an MSVC Makefile.

*  Myriad fixes to allow compiling with Clang from Xcode.

*  Many waves of 'const' correctness, and occasional 'restrict' qualifiers.

*  Many 'sanitizer' directed fixes.

*  Many minor memory leaks cleaned up.

*  Fix event scanning to actually allow <5ms granularity.  Deepened the
   event queue as well.

*  Fix JSx_BTN_28, which has been b0rken for almost 20 years.

*  Fix the spelling of ecs_compat, version, publisher in metadata code.

*  Improve handling of build/release dates in metadata.

*  Fix HH:MM parsing for UTC offsets in metadata.

*  Remove C++14-isms; restrict to C++11 as baseline.

*  Use modern C++ style casts and 'nullptr' rather than 0/NULL in C++ code.

*  Fix include guards to not use _CAPS, but rather CAPS_.

*  Fall back to ECS-disabled if game sets ecs_compat to "enhanced" but no
   ecs.bin is available.

*  Fix documentation for -J flag in --help info.

*  Only print "diagonal bias" for 4diag mode in joystick status output.


-------
 Misc:
-------

*  Experimental Emscripten build.

*  Experimental Termux build.