Add colordiff package

Add perl dependency

Add execute perms to cdiff.sh

packages/colordiff.rb

+require 'package'
+
+class Colordiff < Package
+  description "The Perl script colordiff is a wrapper for 'diff' and produces the same output but with pretty 'syntax' highlighting."
+  homepage 'https://www.colordiff.org/'
+  version '1.0.18'
+  source_url 'https://www.colordiff.org/colordiff-1.0.18.tar.gz'
+  source_sha256 '29cfecd8854d6e19c96182ee13706b84622d7b256077df19fbd6a5452c30d6e0'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'perl'
+
+  def self.install
+    system "sed -i 's,/etc,#{CREW_PREFIX}/etc,g' colordiff.pl"
+    system "sed -i 's,/usr/bin/perl,#{CREW_PREFIX}/bin/perl,' colordiff.pl"
+    system "install -Dm755 colordiff.pl #{CREW_DEST_PREFIX}/bin/colordiff"
+    system "install -Dm755 cdiff.sh #{CREW_DEST_PREFIX}/bin/cdiff"
+    system "gzip -9 cdiff.1 colordiff.1"
+    system "install -Dm644 cdiff.1.gz #{CREW_DEST_PREFIX}/man/man1/cdiff.1.gz"
+    system "install -Dm644 colordiff.1.gz #{CREW_DEST_PREFIX}/man/man1/colordiff.1.gz"
+    system "install -Dm644 colordiffrc #{CREW_DEST_PREFIX}/etc/colordiffrc"
+    system "mkdir -p #{CREW_DEST_DIR}/$HOME"
+    system "ln -s #{CREW_PREFIX}/etc/colordiffrc #{CREW_DEST_DIR}/$HOME/.colordiffrc"
+    system "ln -sf #{CREW_PREFIX}/etc/colordiffrc $HOME/.colordiffrc"
+  end
+end