Phase 5-7: generic inference, extend Type<T>, String stdlib, Map<K,V>, self-hosting audit, docs update

stdlib/Std/Io.bux

@@ -6,5 +6,22 @@ extern func PrintInt(n: int);
 extern func PrintFloat(f: float64);
 extern func PrintBool(b: bool);
 extern func ReadLine() -> String;
+extern func bux_read_file(path: String) -> String;
+extern func bux_write_file(path: String, content: String) -> int;
+extern func bux_file_exists(path: String) -> int;
+
+func ReadFile(path: String) -> String {
+    return bux_read_file(path);
+}
+
+func WriteFile(path: String, content: String) -> bool {
+    let r: int = bux_write_file(path, content);
+    return r != 0;
+}
+
+func FileExists(path: String) -> bool {
+    let r: int = bux_file_exists(path);
+    return r != 0;
+}
 
 }