implement automatic versioning

assets/de.shorsh.discord-screenaudio.metainfo.xml.in

@@ -5,7 +5,7 @@
   <project_license>GPL-3.0+</project_license>
   <name>discord-screenaudio</name>
   <releases>
-    <release version="v1.0.0-rc.11" />
+    <release version="${DISCORD_SCEENAUDIO_VERSION_FULL}" />
   </releases>
 
   <summary>

assets/userscript.js

@@ -122,9 +122,10 @@ setInterval(() => {
   ) {
     for (const el of document.getElementsByClassName("info-3pQQBb")) {
       const aboutEl = document.createElement("div");
-      aboutEl.innerText = "discord-screenaudio v1.0.0-rc.11";
+      aboutEl.innerText = `discord-screenaudio ${window.discordScreenaudioVersion}`;
       aboutEl.style.fontSize = "12px";
       aboutEl.style.color = "var(--text-muted)";
+      aboutEl.style.textTransform = "none";
       aboutEl.classList.add("dirscordScreenaudioAboutText");
       el.appendChild(aboutEl);
     }