Downloadable binaries

[bee344]

Once the compiler reaches a more stable stage and we get static compiler builds, it will be a good idea to have a downloader integrated into the plugin.

[athei]

Eventually, the @parity/revive package will not use the backend but contains a js/wasm version of resolc. So the binary requirement of the hardhat plugin will be dropped.

What remains is the version management. So basically which js version of solc and resolc to use.

[bee344]

Now, for the sake of compatibility, the plugin uses the same functions as @parity/revive with some changes, but once the remix backend is replaced by the wasm/js resolc, we will change the remix option to be package or something like that, to indicate the change.

Depending on the functionalities that the wasm has (which afaik will be the same as the binary), we will dorp the binary alltogether.

Now the binary option is available because it provides way more configuation options than remix, and it could be useful when compiling for something other than testing.