refactor: file attributes

[TrigamDev]

Summary

Refactors and reworks how file attributes (file name, file timestamps) and file properties (file size, duration, etc) are handled.

Previously, file properties would be stored as a FileAttributeData instance that gets filled instantly as a file is loaded, operating under the assumption that all data would be present, and then writing it all to a single label.

File properties are now stored as a dict of FilePropertyTypes and FilePropertyWidgets that get updated by callbacks as file data is loaded. Instead of the formatting taking place in a single, very messy method, the responsibility for formatting falls on the respective FilePropertyWidget, keeping everything cleanly separated.
FileAttributes has also been split into a model, view, and controller in accordance with #950.

Similarly to #1186, relevant files have been sorted into sub directories under the top level views, models, and controllers directories (and mixed, cause also doing in MVC split on media_player.py is way out of scope for this PR). This is again something that can be reverted if this is an unwanted change.

Closes

• [Bug]: File Duration Label Non-Functional #1037

Tasks Completed

• Platforms Tested:
  • Windows x86
  • Windows ARM
  • macOS x86
  • macOS ARM
  • Linux x86
  • Linux ARM
• Tested For:
  • Basic functionality
  • PyInstaller executable