Add FormatDocument command for feature files

[littlegenius666]

Original PR from @Dreamescaper and @claudiobernasconi

Features added:

• choose what will be used for an indent (tabs or spaces)
• choose if lines will be normalized or not
• fixed "jumping cursor" issue
• fixed formatting crashing when the table has only headers
• select the size of indent for different sections of the feature file

[littlegenius666]

@SabotageAndi @Dreamescaper @claudiobernasconi Please advise if you have any additional thoughts on this

[SabotageAndi]

I will have a look at it in the next days. New sprint starts tomorrow and I will add it to it.

[littlegenius666]

I will have a look at it in the next days. New sprint starts tomorrow and I will add it to it.

Thanks!

[SabotageAndi]

I tried it out and it worked really well!
Thanks @littlegenius666, @claudiobernasconi and @Dreamescaper for this new feature. You will make a lot of SpecFlow users happy.

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