Create 3.0 branch for Laravel 6.0 release

[albertski]

The following has been implemented:

• Updated composer files so this project works with Laravel 6.0.
• Fixed any issues that came up with functions missing. (Most were functions that were converted to Arr().
• Added ability to change the column name during query.

"product_years_name" => [
                "label" => "Product Year Name",
                "filter" => [
                    "enabled" => true,
                    "operator" => "="
                ],
                "styles" => [
                    "column" => "grid-w-10"
                ],
                'table_column_name' => 'py.name',
            ],

I was able to create the query with multiple joins using Query Builder. With multiple joins there were multiple tables with the same column name. Adding table_column_name we can allow this to happen.

This should fix #114

[thatsaboi]

can we merge this?

[ayimdomnic]

can this be merged?

[rslugin]

Hi, when this will be merged? Library still not working with Laravel 6/7;