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/gse

@@ -0,0 +1,13 @@
+#name : get/set/member variable
+# --
+private ${1:String} ${2:name};
+
+public void set${2:$(capitalize text)}(final $1 p${2:$(capitalize text)}) {
+  $2 = p${2:$(capitalize text)};
+}
+
+public $1 get${2:$(capitalize text)}() {
+ return $2;
+}
+$0
+