honor symbolic links in templates

[solaegis]

I'd like to suggest an enhancement that would allow boilr to support symbolic links between files. Where Name and Author are defined in project.json, this tree would be properly handled when saved as a template:

.
├── project.json
└── template
    └── {{Name}}
        ├── env.tf
        ├── global-{{Name}}
        └── {{Author}}
            ├── env.tf -> ../env.tf
            └── globals.tf -> ../global-{{Name}}

and would result in the following when used

.
├── project.json
└── template
    └── MyName
        ├── SolAegis
        │   ├── env.tf -> ../env.tf
        │   └── globals.tf -> ../global-MyName
        ├── env.tf
        └── global-MyName

where MyName is supplied for Name and SolAegis is supplied for Author