fix ProcessHelper command splitting

                                  
|Q            |A                 |
|---          |---               |
|Bug Fix?     |y                 |
|New Feature? |n                 |
|BC Breaks?   |n                 |
|Deprecations?|n                 |
|Tests Pass?  |yes |
|Fixed Tickets|#188              |
|License      |MIT               |
|Doc PR       |                  |
                                  
Commands/arguments that are quoted are now split properly 
Surrounding quotes are removed, and escaped quotes are normalized making support for Windows now fully working.

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https://github.com/gushphp/gush/pull/204