Add filename snippets for all filetypes

.vim/snips/all.snippets

@@ -0,0 +1,7 @@
+snippet fne "Filename (+extension)" i
+`!p snip.rv = snip.fn`
+endsnippet
+
+snippet fn "Filename basename" i
+`!p snip.rv = snip.basename`
+endsnippet

.vim/snips/pandoc.snippets

@@ -638,10 +638,6 @@ snippet sketch "Link a sketch" i
 [$1](file:///home/h/sketches/$2)
 endsnippet
 
-snippet fn "Filename"
-`!p snip.rv = snip.basename`
-endsnippet
-
 snippet ` "Inline code" i
 `$1`$2
 endsnippet