Overflow and mrpack fixes, comfortable memory slider and more. (#762)

* Add overflow rules for certain elements.

* Round scrollbar corners to be more attractive.

* Avoid corners in avatar & fix white corner in logs

* Increase step to 64 for memory related inputs.

* Fix overflow on title in mod browse. Fixes #740

* Fix overflow in instance mod browsing.

* Add checks for instances without versions.

theseus_gui/src/pages/Settings.vue

@@ -385,7 +385,7 @@ async function refreshDir() {
           v-model="settings.memory.maximum"
           :min="8"
           :max="maxMemory"
-          :step="1"
+          :step="64"
           unit="mb"
         />
       </div>