Add NumericInputWidget for use with Buefy themes

uses a Vue.js component for better logic encapsulation

tailbone/forms/widgets.py

@@ -58,6 +58,18 @@ class NumberInputWidget(dfwidget.TextInputWidget):
     autocomplete = 'off'
 
 
+class NumericInputWidget(NumberInputWidget):
+    """
+    This widget only supports Buefy themes for now.  It uses a
+    ``<numeric-input>`` component, which will leverage the ``numeric.js``
+    functions to ensure user doesn't enter any non-numeric values.  Note that
+    this still uses a normal "text" input on the HTML side, as opposed to a
+    "number" input, since the latter is a bit ugly IMHO.
+    """
+    template = 'numericinput'
+    allow_enter = True
+
+
 class PercentInputWidget(dfwidget.TextInputWidget):
     """
     Custom text input widget, used for "percent" type fields.  This widget