Speed up initial require with autoload

lib/squib.rb

@@ -1,7 +1,7 @@
+autoload :Cairo, 'cairo'
+autoload :Pango, 'pango'
+autoload :Rsvg,  'rsvg2'
 require 'logger'
-require 'cairo'
-require 'pango'
-require 'rsvg2'
 require 'rainbow/refinement'
 require_relative 'squib/version'
 require_relative 'squib/commands/cli'
@@ -9,7 +9,6 @@ require_relative 'squib/deck'
 require_relative 'squib/card'
 require_relative 'squib/system_fonts'
 
-
 module Squib
   using Rainbow # we can colorize strings now!
 

lib/squib/import/xlsx_importer.rb

@@ -1,4 +1,4 @@
-require 'roo'
+autoload :Roo, 'roo'
 require_relative 'quantity_exploder'
 
 module Squib::Import