Template name is hb_hashmap_t<K,V>.

Sigh...

Not that useful.

Oh well.  Again, who does fully understand what is right???

Next commit needs this.  I never fully get this, sigh.

Not needed anymore.  We just use operator= now.

Let assignment operator worry about conversion.

Now that we require C++11 we can do this.

Fixes 1d75db19

Now that we require C++11, no need to macro.

Leaving hb-atomic.hh as is since harmless and other projects might
copy from that file.

Can be useful when using HarfBuzz for font loading and shaping
but using DirectWrite for rendering.

https://github.com/harfbuzz/harfbuzz/issues/1641

Not planning on using it.  So remove.  Can add later if needed.

I don't like the hb_remove_reference() hack, but necessary.