Webview download fixes - Debug build

Fixes issues around manual downloads starting in the browser instead of the regular downloader, as well as some authentication issues.

Wabbajack - No thread limit debug build

This is an alternative version of the debug build for fixing issues with the new downloader process.

The only change from that version is the removal of the download cap to 8 threads. This version will attempt to start a new download for each thread available on the user's CPU.

Wabbajack - Download issue debug build

Debug build with extra logging to find intermittent issues with the resumable downloads feature.

v2

• Downloads are now saved directly to disk and the required space is reserved before the download starts.

v3

• Reverted changes to manual downloads that redirect to MEGA.
• Limited maximum number of concurrent downloads to 8.

v4

• Increased download timeout to 120 seconds.
• Added logic to retry resumable downloads 3 times.
• Improved logging when attempting to download from WJ mirror.
• Added logging if download exceeds expected size.