* Fix UX of the `c3c project add-target` subcommand
- Fix segfault on `project.json` containing empty map `{}`
- Enable `add-target` to operate on non-existing project files
- Extend `add-target` syntax to accept source through CLI args
This enables the following workflow without friction and needless
crashes:
```console
$ cat > main.c3 <<END
import std::io;
fn void main() {
io::printfn("Hello, World");
}
END
$ c3c project add-target main executable main.c3
$ c3c run
```
* Fix read_project() call in fetch_project()
* Keep the style of curlies consistent
Vendor-fetch download default destination set to dependency-search-path in project.json Add fetched libraries in the project configuration file dependency entry.
Add parsing for the project command and view subcommand. Add basic implementation of c3c project view. Move get_valid_integer into common build.
Co-authored-by: Christoffer Lerno <christoffer.lerno@gmail.com>
