Usage attribute output format - missing spaces, missing lines

[Pitterling]

output of generated usage section need to be adjusted. see PR #376

• output in C# is missing spaces (VB.NET has it)
  - see headfile.bin --> head file.bin
  - see -qfile.bin --> -q file.bin
• missing line between copyright and usage section
• missing line between "scenario lines"

C# output

VB output

[nemec]

Odd that VB and C# behave differently here.

[Pitterling]

• output in C# is missing spaces (VB.NET has it) <-- already fixed since 2.0.257, see PR ReadText.Demo: update nuget to latest beta #390
  - see headfile.bin --> head file.bin
  - see -qfile.bin --> -q file.bin