Add negation function and clean up string library a little.

lib/stdlib.js

   or: function (pred1, pred2) { 
     return pred1 || pred2
   },
+  neg: function (pred) {
+    return !pred
+  },
   modulo: function (arg1, arg2) {
     return {
       value: (arg1.value % arg2.value)

lib/str.js

-const global_obj = {}
-const function_defs = {}
-const warnings = {}
 const builtins = {
   concat: function () {
     let str = ""
       console.error("Undefined function call! No such function: ", prop)
     }
   }, 
-  set: function (target, prop, data) {
-    if (prop === 'w') data.map((w) => warnings.w = true)
-    else console.error("Attempting to set unknown property on interpreter! How did you do that?")
-  }
 }
 
 const proxy_obj = new Proxy({}, my_handler)