v4.8.3

• Session Interface Contract instead of concrete Session class by @techmahedy in #381
• Add a Contract for Password Hashing Services by @techmahedy in #382
• Add a Contract for Encryption Services by @techmahedy in #383
• Add a Contract for Request Abortion Services by @techmahedy in #384
• Add a Contract for Mail Services by @techmahedy in #385
• Add a Contract for Storage Services by @techmahedy in #386
• Add a Contract for URL Generation Services by @techmahedy in #387
• Address review: accept mixed in isValid, resolve url() via contract, reset builder state by @techmahedy in #388
• Introduce a string service contract by @techmahedy in #389
• Introduce a signal bus contract by @techmahedy in #390
• Fix save() leaving the model dirty after a quiet save by @techmahedy in #391
• Fix save() leaving the model dirty after an insert by @techmahedy in #392
• Fix StringService edge cases: mask, isPalindrome, random, truncate and more by @techmahedy in #393
• Fix validator regex alternation, array input 500s and duplicated errors by @techmahedy in #394
• Fix whereIn/orWhereIn with empty lists, qualify OR columns, add whereNotIn to the query builder by @techmahedy in #395