Use protowhat context creation helper

Author: hermansje

shellwhat/sct_syntax.py

@@ -2,16 +2,10 @@
 
 from shellwhat.State import State
 from shellwhat import checks
-import builtins
-from protowhat.sct_syntax import create_sct_context
+from protowhat.sct_syntax import get_checks_dict, create_sct_context
 
 # used in Chain and F, to know what methods are available
-sct_dict = {
-    k: v
-    for k, v in vars(checks).items()
-    if k not in builtins.__dict__
-    if not k.startswith("__")
-}
+sct_dict = get_checks_dict(checks)
 SCT_CTX = create_sct_context(State, sct_dict)
 
 # used in test_exercise, so that scts without Ex() don't run immediately