v4.0.0

• [COOK-3928] Heavily refactoring for readability. Moving platform implementation into separate recipes
• Moving integration tests from minitest to serverspec, removing "improper" tests
• Moving many attributes into the ['mysql']['server']['whatever'] namespace
• [COOK-3481] - Merged Lucas Welsh's Windows bits and moved into own recipe
• [COOK-3697] - Adding security hardening attributes
• [COOK-3780] - Fixing data_dir on Debian and Ubuntu
• [COOK-3807] - Don't use execute[assign-root-password] on Debian and Ubuntu
• [COOK-3881] - Fixing /etc being owned by mysql user