Fixes#3413
Fix the Roblox UI issue where the UI, including chat UI, is not displayed correctly in every game.
* **Bloxstrap/FastFlagManager.cs**
- Add a new method `EnsureUIFlags` to set UI-related flags correctly.
- Call `EnsureUIFlags` in the `Load` method to ensure UI flags are set.
* **Bloxstrap/App.xaml.cs**
- Add a call to `FastFlagManager.EnsureUIFlags` in the `OnStartup` method.
- Add a new method `InitializeUI` to handle additional UI initialization checks.
Roblox now installs to /Roblox/Player/ instead of /Versions/<version guid>
This is a checkpoint commit. No mod manager, no error checking, no fullscreen optimizations configuration. Only installing and launching Roblox.
THIS WORKED FIRST TRY BY THE WAY
