Resolves https://github.com/swiftwasm/carton/issues/175.
I initially thought we should parse `Package.swift` manifests of the whole dependency tree to collect paths to resources from them, but now I'm not even sure that SwiftPM provides an API for this.
Much simpler solution is to serve with `dev` and copy with `bundle` all directories with `.resources` suffixes in the build directory. I think it's quite impossible to stumble upon unrelated directories with this approach, while it still resolves the issue as intended, in my opinion.
Allows passing a path to your custom `index.html` as `--custom-index-page` to `carton dev` and `carton bundle`. The entrypoint script is then injected into this file with a simple text substitution looking for a closing `</head>` tag. The assumption is that your custom `<body>` is not supposed to contain an unescaped `<head></head>`, and adding a dependency on a proper HTML parser to implement this injection is too costly.
Depends on #97.
Resolves#100.
Max Desiatov