Saving new order of source files to project file

[jindraivanek]

Potential problems:

• what to do with other than source file items, do we want to merge their order, or move them down?
• paths that using msbuild properties

[forki]

hey @jindraivanek, @MangelMaxime has an vscode plugin prototype ready. Any chance you could do a bit of this front here?

What I think we need right now is a command line switch for mechanic that actually saves the order to the fsproj. the spupidest thing that could work would help right now.

[jindraivanek]

Great! Saving fsproj works right now when you call Mechanic with one argument (path to fsproj).

[forki]

Awesome

[MangelMaxime]

@jindraivanek Thanks for the info, I need to check on a clean fsproj then :)

[jindraivanek]

This is partially done, closing in favor of #85.