Implement direct download via plugin

plugins/directdownload/src/main/resources/MANIFEST.MF

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+Plugin-Version: 1.0.0-alpha1
+Plugin-Class: de.grimsi.gameyfin.plugins.directdownload.DirectDownloadPlugin
+Plugin-Id: de.grimsi.gameyfin.directdownload
+Plugin-Name: Direct Download
+Plugin-Description: Downloads games directly in the browser.<br>
+ If the game is contained in a folder, it will pack the folder into a zip file on the fly.
+Plugin-Short-Description: Download games directly in the browser
+Plugin-Author: grimsi
+Plugin-License: MIT
+Plugin-Url: https://github.com/gameyfin

plugins/directdownload/src/main/resources/logo.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 256 256">
+    <defs>
+        <linearGradient id="grad1" x1="0%" y1="0%" x2="100%" y2="100%">
+            <stop offset="0%" style="stop-color:#2332c8;stop-opacity:1"/>
+            <stop offset="100%" style="stop-color:#6441a5;stop-opacity:1"/>
+        </linearGradient>
+    </defs>
+    <path fill="url(#grad1)"
+          d="M74.34,85.66A8,8,0,0,1,85.66,74.34L120,108.69V24a8,8,0,0,1,16,0v84.69l34.34-34.35a8,8,0,0,1,11.32,11.32l-48,48a8,8,0,0,1-11.32,0ZM240,136v64a16,16,0,0,1-16,16H32a16,16,0,0,1-16-16V136a16,16,0,0,1,16-16H84.4a4,4,0,0,1,2.83,1.17L111,145A24,24,0,0,0,145,145l23.8-23.8A4,4,0,0,1,171.6,120H224A16,16,0,0,1,240,136Zm-40,32a12,12,0,1,0-12,12A12,12,0,0,0,200,168Z"/>
+</svg>