Windows: Refactor EncryptData.ps1 script. Parameterize, add cluster size auto, robust exFAT sizing, and safety features

- Added parameters for cluster size (auto/manual), encryption/hash, safety margin, VeraCrypt overhead, and VeraCrypt path override
- Switched to iterative exFAT size calculation for accurate FAT/bitmap sizing
- Auto-selects optimal cluster size based on data size
- Supports -WhatIf/-Confirm (SupportsShouldProcess) for safe operation
- Allows password via pipeline or prompt; improved error handling and cleanup
- Enhanced output, free space checks, and force-overwrite option
- Improved code structure, comments, and user feedback

Author: idrassi