feat: implement selection-first multi-target editing

src/ruby_host.rb

@@ -29,6 +29,7 @@ module Vamp
       search search_next search_previous
       word_next word_previous word_end big_word_next big_word_previous big_word_end
       select copy cut change paste_before paste_after
+      select_lines clone_above clone_below select_next skip_occurrence select_all
     ].each do |name|
       action = Action.new("core.#{name}".freeze).freeze
       define_singleton_method(name) { action }