add DUK_MEMZERO()
change DUK_MEMSET() to DUK_MEMZERO() when appropriate
some more indirection for ANSI C functions
promote plain buffer and pointer values to Buffer and Pointer objects in Object constructor (consistent with behavior for other primitive types)
rename DUK_HOBJECT_SET_PROTOTYPE to DUK_HOBJECT_SET_PROTOTYPE_UPDREF to make it clearer that it updates refcounts too (decs old, incs new)
add duk_push_object_helper_proto() which takes an actual prototype pointer (not just a built-in index)
release notes update