Add support for running ltest in the plugin

[oubiwann]

• Convert the existing LFE plugin to Erlang
• Bring that Erlang code into rebar3_lfe
• Stop using test runner's directly
  • use functions that accept options
  • set up the listener based upon parsed options
  • set up the runner based upon parsed options
  • set up the reporter based upon parsed options
• Ensure all options are being used
  • test types are properly limited by --test-type=
  • listeners can be switched out with --test-listener=
  • ANSI colors in output can be disabled with --color=false (accept --colour too)
  • eunit options are passed on to the appropriate listeners
• Test in LFE projects

[oubiwann]

Update 1: This has been filed as ticket in the ltest project: lfex/ltest#66

Update 2: The problem below ended up being in the plugin, not in ltest. It's now fixed.

Making some good progress here. Tests are passing in sample projects that are pulling all the latest code and plugins (from various branches; nothing's been released for those yet).

One issue I am seeing right now is that, even though a project's tests may pass, I still see an error at the end of the test report printout:

===> Uncaught error in rebar_core. Run with DEBUG=1 to see stacktrace or consult rebar3.crashdump
===> Uncaught error: {badrecord,state_t}

and the sole contents of the rebar3.crashdump file are:

Error: {badrecord,state_t}
[]

There is no state_t reference that I could find in ltest.

I need to dig into the final steps of the ltest plugin (reporting, summing stats, etc.), and see where that might be coming from. I checked in otp_src_23.0/lib/eunit/include/eunit.hrl and there's nothing there by that name. Did the same for Erlang 19.3 (no dice).

[oubiwann]

Ah-ha: state_t is from rebar:

• https://github.com/erlang/rebar3/search?q=state_t&unscoped_q=state_t

[oubiwann]

Got this error when running tests in lutil project (the release/0.11.x branch of that repo):

=ERROR REPORT==== 13-Sep-2020::23:31:16.475300 ===
Error in process <0.294.0> with exit value:
{{badmatch,nomatch},
 [{'ltest-util','get-beam',1,[{file,"src/ltest-util.lfe"},{line,9}]},
  {'ltest-util','get-module',1,[{file,"src/ltest-util.lfe"},{line,6}]},
  {'ltest-formatter','mod-line',1,
                     [{file,"src/ltest-formatter.lfe"},{line,75}]},
  {'ltest-listener',handle_begin,3,
                    [{file,"src/ltest-listener.lfe"},{line,18}]},
  {eunit_listener,call,3,[{file,"eunit_listener.erl"},{line,137}]},
  {eunit_listener,group,3,[{file,"eunit_listener.erl"},{line,93}]},
  {eunit_listener,group_loop,4,[{file,"eunit_listener.erl"},{line,98}]},
  {eunit_listener,'-init_fun/2-fun-0-',2,
                  [{file,"eunit_listener.erl"},{line,63}]}]}

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