Refactor variable snippets

* "v" is for shorthand variable declaration
* "vr" is for variable initialization
* "var" is for longhand variable declaration
* "vars" is for multiple variable declarations

Author: Simeon F. Willbanks

snippets/go.snippets

@@ -1,8 +1,17 @@
-# variables
+# shorthand variable declaration
 snippet v
 	${1} := ${2}
+# variable initialization
 snippet vr
+	var ${1:t} ${0:string}
+# variable declaration
+snippet var
 	var ${1} ${2} = ${3}
+# variables declaration
+snippet vars
+	var (
+		${1} ${2} = ${3}
+	)
 # append
 snippet ap
 	append(${1:slice}, ${0:value})