Temporary Poster Background

[bagusnl]

Main Goal

Use poster as temporary background when requested background is not yet downloaded. New background retrieval mechanism:

1. Check if background is downloaded
2. If it's downloaded, then load the downloaded background
3. If not yet downloaded, load either last available regional background or use poster as background instead

Due to the poster having slight transparency, the switching looks a wee bit janky

This PR also contains IOException fixes especially for background loading and image cache processing (really noticeable when user uses Waifu2X)

PR Status :

• Overall Status : Done
• Commits : Done
• Synced to base (Collapse:main) : Yes
• Build status : OK
• Crashing : No
• Bug found caused by PR : 0

[github-actions[bot]]

Qodana for .NET

2 new problems were found

Inspection name	Severity	Problems
Redundant using directive	🔶 Warning	2

💡 Qodana analysis was run in the pull request mode: only the changed files were checked ☁️ View the detailed Qodana report

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[bagusnl]

Merging as no more review came :sadge: