cask: move cask/lib/hbc/* to cask/*.

Fix the load path, requires and some filenames accordingly.

Library/Homebrew/cask/all.rb

+require "hardware"
+
+require "cask/artifact"
+require "cask/audit"
+require "cask/auditor"
+require "cask/cache"
+require "cask/cask"
+require "cask/cask_loader"
+require "cask/caskroom"
+require "cask/checkable"
+require "cask/cli"
+require "cask/cask_dependencies"
+require "cask/exceptions"
+require "cask/installer"
+require "cask/macos"
+require "cask/pkg"
+require "cask/staged"
+require "cask/topological_hash"
+require "cask/utils"
+require "cask/verify"
+require "cask/version"

Library/Homebrew/cask/artifact.rb

+require "cask/artifact/app"
+require "cask/artifact/artifact" # generic 'artifact' stanza
+require "cask/artifact/binary"
+require "cask/artifact/colorpicker"
+require "cask/artifact/dictionary"
+require "cask/artifact/font"
+require "cask/artifact/input_method"
+require "cask/artifact/installer"
+require "cask/artifact/internet_plugin"
+require "cask/artifact/audio_unit_plugin"
+require "cask/artifact/vst_plugin"
+require "cask/artifact/vst3_plugin"
+require "cask/artifact/pkg"
+require "cask/artifact/postflight_block"
+require "cask/artifact/preflight_block"
+require "cask/artifact/prefpane"
+require "cask/artifact/qlplugin"
+require "cask/artifact/screen_saver"
+require "cask/artifact/service"
+require "cask/artifact/stage_only"
+require "cask/artifact/suite"
+require "cask/artifact/uninstall"
+require "cask/artifact/zap"
+
+module Hbc
+  module Artifact
+  end
+end

Library/Homebrew/cask/lib/hbc/artifact/abstract_flight_block.rb → Library/Homebrew/cask/artifact/abstract_flight_block.rb

-require "hbc/artifact/abstract_artifact"
+require "cask/artifact/abstract_artifact"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/abstract_uninstall.rb → Library/Homebrew/cask/artifact/abstract_uninstall.rb

 require "timeout"
 
-require "hbc/artifact/abstract_artifact"
+require "cask/artifact/abstract_artifact"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/app.rb → Library/Homebrew/cask/artifact/app.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/artifact.rb → Library/Homebrew/cask/artifact/artifact.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 require "extend/hash_validator"
 using HashValidator

Library/Homebrew/cask/lib/hbc/artifact/audio_unit_plugin.rb → Library/Homebrew/cask/artifact/audio_unit_plugin.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/binary.rb → Library/Homebrew/cask/artifact/binary.rb

-require "hbc/artifact/symlinked"
+require "cask/artifact/symlinked"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/colorpicker.rb → Library/Homebrew/cask/artifact/colorpicker.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/dictionary.rb → Library/Homebrew/cask/artifact/dictionary.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/font.rb → Library/Homebrew/cask/artifact/font.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/input_method.rb → Library/Homebrew/cask/artifact/input_method.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/installer.rb → Library/Homebrew/cask/artifact/installer.rb

-require "hbc/artifact/abstract_artifact"
+require "cask/artifact/abstract_artifact"
 
 require "extend/hash_validator"
 using HashValidator

Library/Homebrew/cask/lib/hbc/artifact/internet_plugin.rb → Library/Homebrew/cask/artifact/internet_plugin.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/moved.rb → Library/Homebrew/cask/artifact/moved.rb

-require "hbc/artifact/relocated"
+require "cask/artifact/relocated"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/pkg.rb → Library/Homebrew/cask/artifact/pkg.rb

 require "vendor/plist/plist"
 
-require "hbc/artifact/abstract_artifact"
+require "cask/artifact/abstract_artifact"
 
 require "extend/hash_validator"
 using HashValidator

Library/Homebrew/cask/lib/hbc/artifact/postflight_block.rb → Library/Homebrew/cask/artifact/postflight_block.rb

-require "hbc/artifact/abstract_flight_block"
+require "cask/artifact/abstract_flight_block"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/preflight_block.rb → Library/Homebrew/cask/artifact/preflight_block.rb

-require "hbc/artifact/abstract_flight_block"
+require "cask/artifact/abstract_flight_block"
 
 module Hbc
   module Artifact

Library/Homebrew/cask/lib/hbc/artifact/prefpane.rb → Library/Homebrew/cask/artifact/prefpane.rb

-require "hbc/artifact/moved"
+require "cask/artifact/moved"
 
 module Hbc
   module Artifact