added phpconfig.json with support for including/excluding files

[TheColorRed]

Added the ability to create a phpconfig.json.

Supports files and exclude

{
    "files": [
        "filea.php",
        "fileb.php"
    ]
}

{
    "exclude": [
        "some/directory",
        "src/myfile.php",
        "plugins/**/config.json"
    ]
}

If both files and exclude exist, files takes precedence.