feat: add word and WORD motions

src/ruby_host.rb

@@ -27,6 +27,7 @@ module Vamp
       left right down up join_lines line_start line_end delete undo redo command
       normal newline backspace submit
       search search_next search_previous
+      word_next word_previous word_end big_word_next big_word_previous big_word_end
     ].each do |name|
       action = Action.new("core.#{name}".freeze).freeze
       define_singleton_method(name) { action }