Move template sandbox to its own app

Improve UI for the sandbox template textarea.

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/templating/fields.py

@@ -0,0 +1,14 @@
+from __future__ import absolute_import, unicode_literals
+
+from django import forms
+
+from .widgets import TemplateWidget
+
+
+class TemplateField(forms.CharField):
+    widget = TemplateWidget
+
+    def __init__(self, *args, **kwargs):
+        self.model = kwargs.pop('model')
+        self.model_variable = kwargs.pop('model_variable')
+        super(TemplateField, self).__init__(*args, **kwargs)