Improve Haskell language support

Removes the need to call setup_ghc_compilers in every Haskell language
formula, by automatically calling fails_with.

Adds a :home option to the cabal_sandbox method.  This option allows a
specific temporary HOME to be used instead of the current working
directory, and in turn allows a single Cabal package database to be reused
between multiple calls to this method.

Avoids updating the Cabal package database more than once if cabal_sandbox
is called multiple times.

Removes the need to call cabal_clean_lib whenever cabal_sandbox is called,
by automatically cleaning the lib directory.

Adds a :keep_lib option to the cabal_sandbox method.  This option allows
opting out of the automatic cleaning.

Ensures build products are always removed from the current working
directory.

Removes a workaround for versions of cabal-install older than 1.20.0.0.

Adds a cabal_sandbox_add_source method.

Adds a :using option to the install_cabal_package method.  This option
allows specifying the Haskell language tools that are required to install
a particular formula, and in turn allows formulae to be simplified by
replacing calls to multiple methods with a single call to this method.

Allows customizing the call to install_cabal_package by giving a block.

Removes empty method shells.

Closes Homebrew/homebrew#47293.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

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