chore: configuration file and script for versioning

See https://github.com/conventional-changelog/standard-version

.versionrc.js

@@ -0,0 +1,27 @@
+const tracker = {
+  filename: "Version",
+  updater: require("./Scripts/standard-version-updater.js")
+}
+
+module.exports = {
+  tagPrefix: "SOGo-",
+  issueUrlFormat: "https://sogo.nu/bugs/view.php?id={{id}}",
+  compareUrlFormat: "{{host}}/{{owner}}/{{repository}}/compare/{{previousTag}}...{{currentTag}}",
+  types: [
+    {type: "feat",     section: "Features"},
+    {type: "refactor", section: "Enhancements"},
+    {type: "perf",     section: "Enhancements"},
+    {type: "i18n",     section: "Localization"},
+    {type: "fix",      section: "Bug Fixes"},
+    {type: "chore",    hidden:  true},
+    {type: "docs",     hidden:  true},
+    {type: "style",    hidden:  true},
+    {type: "test",     hidden:  true}
+  ],
+  skip: {
+    commit: true,
+    tag: true
+  },
+  packageFiles: [tracker],
+  bumpFiles: [tracker]
+}

Scripts/standard-version-updater.js

@@ -0,0 +1,10 @@
+module.exports.readVersion = function (contents) {
+  // console.debug('readVersion = ' + contents.match(/([0-9]+)/mg).join('.'));
+  return contents.match(/([0-9]+)/mg).join('.');
+};
+
+module.exports.writeVersion = function (contents, version) {
+  // console.debug('writeVersion = ' + version);
+  const versions = version.split('.');
+  return "MAJOR_VERSION=" + versions[0] + "\nMINOR_VERSION=" + versions[1] + "\nSUBMINOR_VERSION=" + versions[2];
+};