This commit returns to a bit less strict checking of the number
of macro arguments, because some old immediate macros rely on a
behavior where even the arity of the macro is not being checked.
It may be better if such macros are just declared to use varargs[expr],
but this remains for another day.
This change was done to avoid confusion with TCP/IP raw sockets. Native sockets
module represents handling native system low level socket API in general and is
not just limited anyhow to TCP/IP raw sockets.
A stub lib/deprecated/pure/rawsockets.nim module has been added as
compatibility layer for old code using rawsockets, so this change will not
break existing code.
Previously introduced node comparison `==` was working somehow wrong on nodes
returned from getType(a), comparing just ids of the symbols.
Recently introduced `==` change 47dce26886
started comparing symbol nodes pointer-wise, thus strictly. Since getType(a)
always creates new symbol pointing to the type, comparing two such nodes using
`==` always returns false, even they point to the same type.
That is why we need a new sameType macro to be able to tell if these nodes
point to the same type.
Since typedesc are exception in macros and they are not implicitly converted to
NimNode on macro call, we need some means to perform such conversion on demand.
Fortunately it is as simple as declaring new magic "NGetType" proc with
typedesc parameter.
NOTE: Keeping actual macro exceptional behavior for typedesc is important,
since it allows passing typedesc macro parameter to other procs or macros
expecting type parameter. If typedesc parameter was implicitly converted, then
we would lost this ability.
