Utilize external directory in ecode profile directory for external tools

[bejolly407]

Should support portable mode, too.

Instead of having to wrestle with PATH and all kinds of wrapper scripts around the ecode executable, just utilize a new directory named external to store external tools: formatters, linters, debuggers, language servers, and might be things like compilers, interpreters, too.

I would compress my portable ecode and upload it to my personal cloud. I can download it and use on any computer like it's home.

For people don't want it, just give them a switch to disable it. Don't need to struggle with whether which versions of external tools are preferred (the ones in PATH or the ones in external?).

[bejolly407]

It might not be as useful as I think.