Add Emacs desktop provisioning and dev toolchain packages

Install Emacs and copy the desktop .emacs.d config so the editor setup is managed with the rest of desktop dotfiles. Add vterm/build/debug dependencies plus C/C++ and Go tooling needed by the configured workflow.

dotfiles/desktop/.emacs.d/snippets/java-mode/tyc

@@ -0,0 +1,8 @@
+#name : try & catch
+# --
+try {
+  $0
+}
+catch (${1:Exception} ${2:e}) {
+  mLogger.error($2);
+}