Update git submodules

* Update plugins/codemirror-editor from branch 'master'
  to 597573b5d1ed44c75844d2b8047aae08f7ef8619
  - Add the light-mode to CodeMirror editor.
    
    Change-Id: I866359f37f425af13612e9fdb60a669f74b05616
    

plugins/codemirror-editor

diff --git a/plugins/codemirror-editor b/plugins/codemirror-editor
index 07225d5..597573b 160000
--- a/plugins/codemirror-editor
+++ b/plugins/codemirror-editor
@@ -1 +1 @@
-Subproject commit 07225d5388658f7354f9f85241c547117c590f82
+Subproject commit 597573b5d1ed44c75844d2b8047aae08f7ef8619