Write annotation before template declarations

Prior to this fix the annotation was written after the template
declaration in case the cursor did not happen to be on the same line as
the template declaration.

lua/neogen/configurations/c.lua

@@ -104,6 +104,23 @@ return {
         },
     },
 
+	locator = function(node_info, nodes_to_match)
+		local result = neogen.default_locator(node_info, nodes_to_match)
+		if not result then
+			return nil
+		end
+		-- if the function happens to be a function template we want to place
+		-- the annotation before the template statement and extract the
+		-- template parameters names as well
+		if node_info.current:parent() == nil then
+			return result
+		end
+		if node_info.current:parent():type() == "template_declaration" then
+			return result:parent()
+		end
+		return result
+	end,
+
     -- Use default granulator and generator
     granulator = nil,
     generator = nil,