lang: funcs: core: Move world API functions

Some of the core functions interact with the remote "world" API. Move
them all into the same package.

examples/lang/exchange0.mcl

@@ -6,9 +6,10 @@
 # time ./mgmt run --hostname h4 --seeds http://127.0.0.1:2379 --client-urls http://127.0.0.1:2385 --server-urls http://127.0.0.1:2386 --tmp-prefix --no-pgp lang --lang examples/lang/exchange0.mcl
 
 import "sys"
+import "world"
 
 $rand = random1(8)
-$exchanged = exchange("keyns", $rand)
+$exchanged = world.exchange("keyns", $rand)
 
 file "/tmp/mgmt/exchange-${sys.hostname()}" {
 	content => template("Found: {{ . }}\n", $exchanged),

examples/lang/schedule0.mcl

@@ -1,4 +1,5 @@
 import "sys"
+import "world"
 
 # here are all the possible options:
 #$opts = struct{strategy => "rr", max => 3, reuse => false, ttl => 10,}
@@ -10,10 +11,10 @@ import "sys"
 $opts = struct{strategy => "rr", max => 2, ttl => 10,}
 
 # schedule in a particular namespace with options:
-$set = schedule("xsched", $opts)
+$set = world.schedule("xsched", $opts)
 
 # and if you want, you can omit the options entirely:
-#$set = schedule("xsched")
+#$set = world.schedule("xsched")
 
 file "/tmp/mgmt/scheduled-${sys.hostname()}" {
 	content => template("set: {{ . }}\n", $set),

examples/lang/sendrecv3.mcl

@@ -1,7 +1,8 @@
 import "fmt"
+import "world"
 
 $ns = "estate"
-$exchanged = kvlookup($ns)
+$exchanged = world.kvlookup($ns)
 $state = maplookup($exchanged, $hostname, "default")
 
 exec "exec0" {

examples/lang/states0.mcl

@@ -1,5 +1,7 @@
+import "world"
+
 $ns = "estate"
-$exchanged = kvlookup($ns)
+$exchanged = world.kvlookup($ns)
 
 $state = maplookup($exchanged, $hostname, "default")