move engine/internals to top-level
and fix and add some
reorg index
rename intro of handbook to history, provide a history.
remove wcwidth: this is now built-in by blessed
Update the handbook some
remove another "whats next" and ttyplay reference
Merge remote-tracking branch 'origin/master' into 2.0-docfixes

Conflicts:
	docs/developers.rst
	x84/bbs/wcwidth.py
Merge pull request #153 from jquast/2.0-docfixes

2.0 docfixes