remove some deprecated pre-1.0 stdlib modules (#20202)

* remove pre-1.0 stdlib deprecations

notable exceptions:
* ze, toU8 etc in system/arithmetics
* potentially callsite

* undo macros, ospaths, securehash, oswalkdir

* add sets back

* add back future, document deprecated versions

* add to changelog [skip ci]

tests/misc/tevents.nim

@@ -1,48 +0,0 @@
-discard """
-output: '''
-HandlePrintEvent: Output -> Handled print event
-HandlePrintEvent2: Output -> printing for ME
-HandlePrintEvent2: Output -> printing for ME
-'''
-"""
-
-import events
-
-type
-  PrintEventArgs = object of EventArgs
-    user*: string
-
-proc handleprintevent*(e: EventArgs) =
-    write(stdout, "HandlePrintEvent: Output -> Handled print event\n")
-
-proc handleprintevent2*(e: EventArgs) =
-    var args: PrintEventArgs = PrintEventArgs(e)
-    write(stdout, "HandlePrintEvent2: Output -> printing for " & args.user)
-
-var ee = initEventEmitter()
-
-var eventargs: PrintEventArgs
-eventargs.user = "ME\n"
-
-##method one test
-
-ee.on("print", handleprintevent)
-ee.on("print", handleprintevent2)
-
-ee.emit("print", eventargs)
-
-##method two test
-
-type
-  SomeObject = object of RootObj
-    printEvent: EventHandler
-
-var obj: SomeObject
-obj.printEvent = initEventHandler("print")
-obj.printEvent.addHandler(handleprintevent2)
-
-ee.emit(obj.printEvent, eventargs)
-
-obj.printEvent.removeHandler(handleprintevent2)
-
-ee.emit(obj.printEvent, eventargs)

tests/types/tillegaltyperecursion.nim

@@ -1,66 +1,17 @@
 discard """
   cmd: "nim $target --threads:on $options $file"
   errormsg: "illegal recursion in type 'TIRC'"
-  line: 16
+  line: 12
 """
 
-import events
 import net
 import strutils
 import os
 
 type
-    TMessageReceivedEventArgs = object of EventArgs
-        Nick*: string
-        Message*: string
     TIRC = object
-        EventEmitter: EventEmitter
-        MessageReceivedHandler*: EventHandler
         Socket: Socket
         Thread: Thread[TIRC]
 
 proc initIRC*(): TIRC =
     result.Socket = socket()
-    result.EventEmitter = initEventEmitter()
-    result.MessageReceivedHandler = initEventHandler("MessageReceived")
-
-proc IsConnected*(irc: var TIRC): bool =
-    return running(irc.Thread)
-
-
-proc sendRaw*(irc: var TIRC, message: string) =
-    irc.Socket.send(message & "\r\L")
-proc handleData(irc: TIRC) {.thread.} =
-    var connected = False
-    while connected:
-        var tup = @[irc.Socket]
-        var o = select(tup, 200)
-        echo($o)
-        echo($len(tup))
-        if len(tup) == 1:
-            #Connected
-            connected = True
-
-            #Parse data here
-
-        else:
-            #Disconnected
-            connected = False
-            return
-
-proc Connect*(irc: var TIRC, nick: string, host: string, port: int = 6667) =
-    connect(irc.Socket, host, TPort(port), TDomain.AF_INET)
-    send(irc.Socket,"USER " & nick & " " & nick & " " & nick & " " & nick & "\r\L")
-    send(irc.Socket,"NICK " & nick & "\r\L")
-    var thread: Thread[TIRC]
-    createThread(thread, handleData, irc)
-    irc.Thread = thread
-
-
-
-
-when true:
-    var irc = initIRC()
-    irc.Connect("AmryBot[Nim]","irc.freenode.net",6667)
-    irc.sendRaw("JOIN #nim")
-    os.Sleep(4000)