Async downloader, better Proton support (#183)

* feat: async downloader + other fixes

* feat: windows command parsing + use library path for install path

* feat: better proton support

* feat: style fixes and store button now uses in-app

* feat: emulator rename + umu emulator fix

* feat: bring process creation inline with docs

* fix: clippy

main/components/Header.vue

@@ -28,6 +28,7 @@
       />
       <div class="inline-flex items-center">
         <ol class="inline-flex gap-3">
+          <HeaderProtonSupportWidget />
           <HeaderQueueWidget :object="currentQueueObject" />
           <li v-for="(item, itemIdx) in quickActions">
             <HeaderWidget