Name sheets in export

[rap2hpoutre]

According to this comment, it would be great to be able to name sheets. As suggested by @harty, it could be done in SheetCollection constructor:

$sheets = new SheetCollection(
    [User::all(), Project::all()], 
    ['users sheet', 'project sheet']
);

So it means a new property (names) could be added to SheetCollection then it could be passed as a second argument in the SheetCollection constructor.

The main advantage to add it in the constructor is that (in a second step), it could be used in import process too: the sheet names would be loaded from the importSheets function that returns the SheetCollection. So that's cool.

One disadvantage of creating the name of the sheets via SheetCollection constructor is that there is no way to name a sheet when exporting only a Collection (e.g only one sheet) but I'm not sure it's an actual issue: the main goal is to name sheets in multiple sheets export.

[SimoTod]

How about

    'users sheet' => User::all(),
    'project sheet' => Project::all()
]);``` and still supporting `$sheets = new SheetCollection([User::all(), Project::all()]);` if you don't want to change sheet names?

When exporting a single collection, you would use `$sheets = new SheetCollection(['users' => User::all()]);`

[rap2hpoutre]

@SimoTod ... 👍 👍

You are totally right. Your suggestion is really good, thank you so much! I will develop it following your advice. So:

$sheets = new SheetCollection(['users' => User::all()]);
(new FastExcel($sheets))->export('file.xlsx');

[rap2hpoutre]

Fixed via 059442e available in v0.9.0