Add "most of" Buefy support for grid filters

still a couple of details to wrap up yet, but this is most of it!

tailbone/static/js/tailbone.buefy.gridfilters.js

@@ -0,0 +1,24 @@
+
+const GridFilter = {
+    template: '#grid-filter-template',
+    props: {
+        filter: Object
+    },
+
+    methods: {
+
+        changeVerb() {
+            // set focus to value input, "as quickly as we can"
+            this.$nextTick(function() {
+                this.focusValue()
+            })
+        },
+
+        focusValue: function() {
+            this.$refs.valueInput.focus()
+            // this.$refs.valueInput.select()
+        }
+    }
+}
+
+Vue.component('grid-filter', GridFilter)

tailbone/static/themes/falafel/css/filters.css

@@ -0,0 +1,8 @@
+
+/******************************
+ * Grid Filters
+ ******************************/
+
+.filters .filter {
+    margin-bottom: 0.5rem;
+}