help options for inputs, outputs and transforms

src/include/inputFns.js

@@ -1,4 +1,8 @@
 var _inputFns = new Map([
+    ["?"    , (_res, options) => {
+        _res = Array.from(_inputFns.keys()).filter(r => r != '?').sort()
+        _$o(_res, options)
+    }],
     ["pm"   , (_res, options) => { 
         _showTmpMsg()
         if (isDef(__pm._map)) _res = __pm._map

src/include/outputFns.js

@@ -1,4 +1,8 @@
 var _outputFns = new Map([
+    ["?" , (r, options) => {
+        r = Array.from(_outputFns.keys()).filter(r => r != '?').sort()
+        $o(r, options)
+    }],
     ["pm", (r, options) => {
         $o(r, options)
     }],

src/include/transformFns.js

@@ -1,4 +1,10 @@
 var _transformFns = {
+    "transforms"    : _r => {
+        if (toBoolean(params.transforms)) {
+            var _t = Object.keys(_transformFns).filter(r => r != 'transforms').sort()
+            return _t
+        }
+    },
     "sortmapkeys"   : _r => {
         if (toBoolean(params.sortmapkeys) && isObject(_r)) {
             let _sortMapKeys = (aMap, moreLevels) => {