Merge for v5.0.0 release

[estruyf]

✨ New features

• #113: Integrating a local DB for media metadata (caption, alt)
• #132: Major changes to the media dashboard which allows you to navigate through all folders

🎨 Enhancements

• #110: Add support for workspaces with multiple folders
• #117: Allow to specify a single line of text in the metadata fields
• #119: Multi-select support for choice fields
• #121: Choice fields support ID/title objects as well as a regular string
• #122: Update the filenames of your media
• #124: Add new isPreviewImage property to the content type field to specify custom preview images
• #126: Create new content from the available content types
• #127: Title bar action added to open the dashboard
• #128: Support for multi-select on image fields added
• #131: Folder creation support added on media dashboard
• #134: On startup, the extension checks if local settings can be promoted
• #135: Hidden property added for field configuration
• #137: Ask to move the .templates folder to the new .frontmatter folder

🐞 Fixes

• #120: Choice and number field not updating when set manually in the front matter of the file
• #133: Fix for overriding default content type settings