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/js2-mode/a

@@ -0,0 +1,4 @@
+#name : new array
+# --
+var ${1:myArray} = new Array();
+$0

dotfiles/desktop/.emacs.d/snippets/js2-mode/fn

@@ -0,0 +1,6 @@
+#name : function
+# --
+function ${1:test}(${2:pValue}) {
+  $0
+}
+

dotfiles/desktop/.emacs.d/snippets/js2-mode/for

@@ -0,0 +1,5 @@
+#name : for (...; ...; ...) { ... }
+# --
+for (var ${1:i} = 0; $1 < ${2:args.length}; $1${3:++}) {
+  $0
+}   

dotfiles/desktop/.emacs.d/snippets/js2-mode/if

@@ -0,0 +1,6 @@
+#name : if
+# --
+if (${1:s} == ${2:undefined}) {
+  $0
+}
+

dotfiles/desktop/.emacs.d/snippets/js2-mode/log

@@ -0,0 +1,3 @@
+#name : log
+# --
+console.log("$0");