[Windows] Improve console wrapper script to handle stdin and child processes.

[bruvzg]

Uses PowerShell Start-Process cmdlet to start and wait for the Godot editor process, which:

• Correctly passes stdin input to the Godot process.
• Unlike cmd, it waits for the all child processes as well.

Additional changes:

• Passes command line arguments from the script (%*).
• Fixes start if executable is not in the current working directory, by adding script path (%~dp0).
• Set console title to "Godot Engine".