Add Vue Markdown filters.

{{ '**strong** _em_' |markdown }} gives:
<p><strong>strong</strong> <em>em</em></p>

{{ '**strong** _em_' |markdownInline }} gives:
<strong>strong</strong> <em>em</em>

lib/www/client/source/package-lock.json

@@ -16,6 +16,7 @@
         "leaflet-arrowheads": "^1.2.2",
         "leaflet-realtime": "^2.2.0",
         "leaflet.markercluster": "^1.4.1",
+        "marked": "^2.0.3",
         "typeface-roboto": "0.0.75",
         "vue": "^2.6.12",
         "vue-debounce": "^2.5.7",
@@ -7375,6 +7376,17 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/marked": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-2.0.3.tgz",
+      "integrity": "sha512-5otztIIcJfPc2qGTN8cVtOJEjNJZ0jwa46INMagrYfk0EvqtRuEHLsEe0LrFS0/q+ZRKT0+kXK7P2T1AN5lWRA==",
+      "bin": {
+        "marked": "bin/marked"
+      },
+      "engines": {
+        "node": ">= 8.16.2"
+      }
+    },
     "node_modules/md5.js": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/md5.js/-/md5.js-1.3.5.tgz",
@@ -19247,6 +19259,11 @@
         "object-visit": "^1.0.0"
       }
     },
+    "marked": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-2.0.3.tgz",
+      "integrity": "sha512-5otztIIcJfPc2qGTN8cVtOJEjNJZ0jwa46INMagrYfk0EvqtRuEHLsEe0LrFS0/q+ZRKT0+kXK7P2T1AN5lWRA=="
+    },
     "md5.js": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/md5.js/-/md5.js-1.3.5.tgz",

lib/www/client/source/package.json

@@ -14,6 +14,7 @@
     "leaflet-arrowheads": "^1.2.2",
     "leaflet-realtime": "^2.2.0",
     "leaflet.markercluster": "^1.4.1",
+    "marked": "^2.0.3",
     "typeface-roboto": "0.0.75",
     "vue": "^2.6.12",
     "vue-debounce": "^2.5.7",

lib/www/client/source/src/lib/markdown.js

@@ -0,0 +1,11 @@
+const marked = require('marked');
+
+function markdown (str) {
+  return marked(String(str));
+}
+
+function markdownInline (str) {
+  return marked.parseInline(String(str));
+}
+
+module.exports = { markdown, markdownInline };

lib/www/client/source/src/main.js

@@ -5,12 +5,16 @@ import store from './store'
 import vuetify from './plugins/vuetify'
 import vueDebounce from 'vue-debounce'
 import { mapMutations } from 'vuex';
-
+import { markdown, markdownInline } from './lib/markdown';
 
 Vue.config.productionTip = false
 
 Vue.use(vueDebounce);
 
+Vue.filter('markdown', markdown);
+Vue.filter('markdownInline', markdownInline);
+
+
 new Vue({
   data () {
     return {