Refactor support for values in file properties

[mcaskill]

Improve support for multilingual/multiple values across various methods of FileProperty and its variants.

Validation will now (correctly) log a message if a value (i.e., a file) is missing, is unparsable, is a rejected MIME type, or exceeds a maximum file size.

Breaking Changes:

• Removed deprecated accessor methods in favour of get-prefix variants
• Refactored validation methods to focus on values (i.e., files) directly
• Changed how default MIME types are defined to allow overriding in media-specific properties

Fixed:

• Edge case where MIME type resolution returns "inode/x-empty" or empty string
• Edge cases where a string is expected
• Support for validating/handling multilingual/multiple values

Added:

• Option fallbackFilename to customize generated filename (defaults to property label)
• Method hasAcceptedMimetypes() to check if any custom or fallback MIME types are specified
• Method getDefaultAcceptedMimetypes() to distinguish between custom and fallback MIME types in property variants like ImageProperty and AudioProperty
• Method assertValidUploadPath() to ensure upload path exists (or creates it) and checks if writable
• Methods isAcceptedMimeType() and isAcceptedFilesize()
• Methods generateExtensionFromFile(), generateExtensionFromMimeType(), and resolveExtensionFromMimeType()
• Method formatFilesize() to format bytes into a human-readable unit
• Method pathFor() to make an absolute path to a directory or file
• Method parseValAsFileList() to flatten value object to simplify validation and parsing of values

Changed:

• Bump branch-alias to 0.11
• Moved default MIME types from getAcceptedMimeTypes() to new getDefaultAcceptedMimetypes() for ImageProperty and AudioProperty
• Fallback routine in method getMimetype() to retrieve the MIME type of the first value
• Fallback routine in method getFilesize() to retrieve the MIME type of the first value
• Renamed validation methods and internal routines to validate MIME type and size of available values (ignoring getMimetype() and getFilesize)
• Unified methods dataUpload() and fileUpload() to throw exceptions
• Unified methods saveDataUploads() and saveDataUploads() to catch exceptions and log errors
• Replaced validation methods with new isAccepted*() methods inside dataUpload() and fileUpload()
• Method dataUpload() to generate filename and extension before calling uploadTarget()
• Method uploadTarget() to simplify making of filename
• Method generateFilename() to use fallbackFilename and sanitize value

Removed:

• Aliases filesize(), mimetype(), mimetypeFor() in favour of their get-prefixed methods