define _CRT_SECURE_NO_WARNINGS as initial fix for compiling more cleanly for windows store apps
unary minus fixes reported by MSVC, one cast fix in regexp compiler
add a few notes on MSVC defines, _MSVC_FULL_VER
release note update (tentative)
relocate msvc secure crt tweak
authors update
use _vsnprintf() in older MSVC versions
fix a 'naked' use of int64_t (not duk_int64_t) in numconv, and similar ones in debug size dumps
fix a few coercion warnings which appear on 64-bit windows compile
when building dist-src, also make variants with git describe in the filename for easier identification of snapshots
Merge branch 'win-crt-fixes'

Improves Windows build by disabling secure CRT warnings.  This is especially
useful for Windows store applications.  Also provides a few typing fixes but
does not resolve all /Wp64 warnings.