Enchance imageviewer: Downloadprogressbar, error placeholder + retry, large images subsampling, SVG support

[MV-GH]

Before we were recreating a bunch of imageloaders which were creating a bunch of HttpClients. This pr aims to solve this.

• Make imageloader a singleton that gets reused
• Make HTTPclient a singleton that gets resused
• Add SVG support
• Moved application to a seperate file
• Added a loadingbar to the imageviewer that tracks the download progress of the image
• increase the ability to zoom in
• Opened: Zooming in on large images, makes the image blurry likely due to downsampling, support "resampling" coil-kt/coil#1833
• Used a ZoomableAsyncImage instead now, which supports subsampling larges images
• Added error placeholder (I drew that myself found no SVG CC error placeholder images)
• Added foundation to track upload/download progress
• Removed useless repository section in build :Jerboa, it gets overwritten from settings.gradle anyway, wasted some time on that

OkHttp performs best when you create a single OkHttpClient instance and reuse it for all of your HTTP calls. This is because each client holds its own connection pool and thread pools. Reusing connections and threads reduces latency and saves memory. Conversely, creating a client for each request wastes resources on idle pools.

Loading bar example

studio64_kcQHmGd8PN.mp4

error failure

studio64_RvFLc7Fpxh.mp4

Large image subsampling

studio64_mpNOL3St41.mp4

ZoomableAsyncImage does have some slight issues. I can revert back to AsymcImage untill they are fixed.

see https://github.com/saket/telephoto/issues

[dessalines]

Works well, thx!

[dessalines]

Wish these things were already built in to the http clients. oh well.