Consistent route structure

[velrest]

Our current route structure is very chaotic and inconsistent. The entrance tree should be the standard:

• the actual form is in /edit/index and not in /edit/form
• linked-buildings should just be buildings
• building should be a sub route of project if possible

addon/routes
├── application.js
├── building
│   ├── edit
│   │   ├── dwelling
│   │   │   ├── edit.js
│   │   │   └── new.js
│   │   ├── dwelling.js
│   │   ├── dwellings.js
│   │   ├── entrance
│   │   │   ├── edit
│   │   │   │   ├── index.js
│   │   │   │   └── link-street.js
│   │   │   ├── edit.js
│   │   │   └── new.js
│   │   ├── entrance.js
│   │   ├── entrances.js
│   │   ├── form.js
│   │   └── index.js
│   ├── edit.js
│   └── new.js
├── building.js
├── project
│   ├── form.js
│   ├── index.js
│   ├── linked-buildings.js
│   └── new.js
├── project.js
├── search-building.js
└── search-project.js