Cleanup and bring code up to Drupal standards

Running this module through the Coder module's check results in more than 400 warnings. Most are simple things like spacing,missing newlines and whatnot; however there are some errors in there that should be rectified in short order, namely "use quotes around a string literal array index, this is not only a style issue, but a known performance problem".

Example:

$table = $settings[civicrm_constant_contact_sync_group][table_name];

should be:

$table = $settings['civicrm_constant_contact_sync_group']['table_name'];