Support pre input -i with % in Windows OS

[nhymxu]

Example: $process->addPreInputCommand('-i', $example_images_dir."P1110%d.jpg");

[buggedcom]

Where is ===NXBYPASS=== being set?

[nhymxu]

@buggedcom: using in str_replace. Replace all % character to ===NXBYPASS===
after escapeshellarg, replace ===NXBYPASS=== back to %.
Because you can't run with escapeshellarg in Windows.

I tested and work well.