callbacks update - now callbacks can ask window for repaint

src/util.py

@@ -1,4 +1,4 @@
-
+import os
 
 program_version = '0.0.1 (alpha)'
 
@@ -15,3 +15,7 @@ def string_to_bin(tox_id):
 def bin_to_string(raw_id):
     res = ''.join('{:02x}'.format(ord(x)) for x in raw_id)
     return res.upper()
+
+
+def curr_directory():
+    return os.path.dirname(os.path.realpath(__file__))