Fixed bug where all func calls require an argument

Certain I/O functions (like `inp` or `repl`) do not need arguments, but
previously all functions required at least one argument to called correctly
(i.e. `(inp 0)` or `(repl "banana")`). Now, these can be called as intended:
`(inp)` or `(repl)`.

src/env.c

@@ -15,8 +15,13 @@ Object fetchFromEnvironment(const char *name, struct Environment *env)
     if(!env)
         return errorObject(NULL_ENV);
 
-    if(env->size == 0)
-        return errorObject(EMPTY_ENV);
+    if(env->size == 0) {
+        if (env->outer) {
+            return fetchFromEnvironment(name, env->outer);
+        } else {
+            return errorObject(EMPTY_ENV);
+        }
+    }
 
     for(int i = 0; i < env->size; i++) {
         if(env->strings[i] == NULL) {

src/examples/repl.pbl

@@ -1,10 +1,10 @@
 #!/usr/bin/pl
-(def repl (fn (_) (
+(def repl (fn () (
   (prn "pebblisp::> ")
-  (def input (inp 0))
+  (def input (inp))
   (if (= input "q") () (
       (prnl (eval input))
-      (repl 0)))
+      (repl)))
 )))
 
-(repl 0)
+(repl)

src/pebblisp.c

@@ -162,6 +162,10 @@ Object listEvalFunc(
     const int length,
     struct Environment *env)
 {
+    if(length == 0) {
+        return function->func(boolObject(0), boolObject(0), env);
+    }
+
     Object rest[length];
     evalForms(rest, list->list->forward, env);
 
@@ -244,13 +248,6 @@ Object evalList(const Object *obj, struct Environment *env)
         return cloneObject(*obj);
     }
 
-    if(evalLength == 1) {
-        if(listLength(obj->list) == 0) {
-            return cloneObject(*obj);
-        }
-        return startList(eval(obj->list, env));
-    }
-
     Object *first_form = obj->list;
 
     { // Try to eval built-ins