Make error if there's no such type, properties and interface in scope

[zhiburt]

Hey Eliot you prolong creating nice stuff.
Personally I am pleased to see this repository.
Thanks for that.

So what about problem.
I believe that if we cannot find type, interface and property in time when we parse AST is a problem and we should notify about that user

At present it is going to be adjourned to compile's message.

What I mean

if we have such file as this

services:
  DoSomething:
    type: '*Worker'
    interface: Do
    properties:
      Name: '"Bil"'

If there's no type, interface or property like this, some useful information could be displayed

[lucas-gio]

Hello to all!!!
I give an error in my incorrect input, but withouts warnings, really is very difficult know the problem.
Im my file:
datasourceService:
type: '*DatasourceService'
interface: IDatasourceService.go
properties:
configurationService: '@{configurationService}'

The .go of the interface field generate an invalid value in dingo.go, then the error is given:
panic: dingo.go:8:39: expected 'IDENT', found 'go' (and 1 more errors)

goroutine 1 [running]:
main.(*File).getPackageName(0xc00005e7b0, 0x58e88d, 0x9, 0x0, 0x0)
/home/pc/go/pkg/mod/github.com/elliotchance/[email protected]/file.go:108 +0x405
main.main()
/home/pc/go/pkg/mod/github.com/elliotchance/[email protected]/main.go:38 +0x333

Other observation: if i have an invalid value, and an incorrect file dingo.go is generated, later i cant use again dingo command. Is needed remove the file by hand. The command would delete the dingo.go file before.