Documentation needed for WiX Toolset MsBuild integration

[tpaxatb]

MsBuild projects can now support version information via $(var.GitVersion_*) variables, need to document their names and usage.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. After 30 days from now, it will be closed if no further activity occurs. Thank you for your contributions.

[gep13]

I am going to remove the stale label from this issue, as I believe it is still relevant, and there has been at least one request for it to be included.

@tpaxatb would you be in a position to provide some docs for this usage?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. After 30 days from now, it will be closed if no further activity occurs. Thank you for your contributions.

[asbjornu]

Could you please take a look at this, @tpaxatb?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. After 30 days from now, it will be closed if no further activity occurs. Thank you for your contributions.