Just some clean up reorganization around flatbuffer/minimal dispatch
code. This is prep for adding a JSON dispatcher.

groupCollapsed alias to group, remove noTrailingNewline, move newline 
out of stringifyArgs, fix console.dir, add tests, and fix a repl log quirk.
For repl logging quirks, I believe we should not indent repl logging. If
we really want such indentation, we probably also want to indent "> "
prompts.

This is causing a segfault for unknown reasons - see #2787.

This reverts commit 498f6ad4.

readSync and writeSync use dispatch_minimal now.

Note cli/dispatch_minimal.rs ops are not yet included in cli/ops.

This is part of work towards #2730

* Propagate Url::to_file_path() errors instead of panicking

Removes the magic number hack to switch between flatbuffers and the
minimal dispatcher.

Adds machinery to pass the op_id through the shared_queue.

Tip: RUSTC_WRAPPER should be unset for incremental builds to work.

And throws without allow-env 

Deno.core.dispatch() used to push the "control" buf onto the shared
array buffer before calling into V8, with the idea that it was one less
argument to parse. Turns out there is no more overhead passing the
control ArrayBuffer directly over. Furthermore this optimization was
making the refactors outlined in #2730 more complex. Therefore it is
being removed.

This is a minor feature which complicates the build signifigantly.
Removing to ease refactoring the build system:
https://github.com/denoland/deno/issues/2608

A crate can assign an alternative name, different from the crate name,
when importing another crate. On the command line this looks like:

  rustc ... --extern foo_crate=path/to/bar_crate.rlib

We need to support this so we can eventually upgrade to rand-0.7.x.

based on https://w3c.github.io/FileAPI/#convert-line-endings-to-native