- Uses the code at https://github.com/tsloughter/rebar_alias and brings
  it within rebar3
- adds safety checks to prevent redefining built-in commands or obvious
  circular dependencies between commands (indirect circular deps are
  still possible)
- adds tests
- adds a systest to ensure no clash with the existing plugin

Updates relx (windows fixes) and erlware commons (strings)

- OTP-21 readiness, Full Unicode support, massive dep upgrade
- fixed handling of proxy username and password when fetching registry
- git versions from tag made consistent and all strip 'v' prefix
- Prevent hard crash on duplicate plugin paths
- Fix include paths in profile multiapp edge case
- Fix unlock state carry, which broke do sequences with unlock in them.
- Avoid guessing on utf8 decoding of app files
- Various fixes related to .app files
- Warn user when an unsupported local git or hg resource is used
- Corrects a fix to src_dir values
- Update eunit_formatters to latest version
- Changes in wording of warnings for more accuracy

was still hardcoded to 3.4.4

- fix sys config merging
- Fix relative src_dir specifications to avoid
  double .app.src file detection
- Recompile when include files change in
  non-default directories

Includes Relx fixes

Signed-off-by: Fred Hebert <mononcqc@ferd.ca>

Patches:

- Try to start epmd when distribution fails
- Allow non-default profile deps upgrade
- Switch default license in templates to Apache 2.0, and hook it up in
  the .app file
- Fix git SHA comparisons for dep update
- Let relx know about rebar-specified erl_opts
- Use rm_rf instead of ec_file:delete, fixing some deps-related issues
  on Windows
- Handle internal CT failures
- Fix profile merging of erl_first_files options
- Fix CT output in skipped test cases and failing end of function
  hooks
- Officially drop R15 support, since its SSL libs can no longer talk
  to hex.pm
- REBAR_COLOR supports all ec_cmd_log intensity options, allowing the
  none value to disable all colors without dropping termcap support
- Bump relx to 3.22.4

The one new feature supported here is for the interactive shell:

- Support commands in the shell such as r3:Command(),
  r3:Command("--args=as a string"), or r3:Command(Namespace, "--args=as a
  string"), instead of just r3:do(Command).

- [OSX tests added to CI](https://github.com/erlang/rebar3/pull/1471),
joining linux and windows 10
- [upgrade relx to 3.22.3](https://github.com/erlang/rebar3/pull/1518),
[fixing multiple
issues](https://github.com/erlware/relx/releases/tag/v3.22.3)
- [Fixing eunit errors in 19.3 when `init_per_*` isn't paired with
`end_per_*`](https://github.com/erlang/rebar3/pull/1516)
- [Allow single test spec in
ct_opts](https://github.com/erlang/rebar3/pull/1506)
- [Properly warn when missing inets at
runtime](https://github.com/erlang/rebar3/pull/1505)
- [rebar_utils:escape_chars handles quotes in
paths](https://github.com/erlang/rebar3/pull/1504)
- [Fix typo in help text for upgrade
command](https://github.com/erlang/rebar3/pull/1503)
- [change package version warnings to debug
level](https://github.com/erlang/rebar3/pull/1502)
- [Path-type sensitive .cmd creation for
escripts](https://github.com/erlang/rebar3/pull/1500)
- [Windows escripts get cmd
autogenerated](https://github.com/erlang/rebar3/pull/1494)
- [REBAR_CONFIG impacts config file for project root
only](https://github.com/erlang/rebar3/pull/1497)
- [Fix wildcard usage in rebar3
clean](https://github.com/erlang/rebar3/pull/1498)
- [Bump cth_readable to
1.2.4](https://github.com/erlang/rebar3/pull/1496) (fixing some
erroneous reports when suites get skipped)
- [Add respect for src_dirs option in app_discover and
app_info](https://github.com/erlang/rebar3/pull/1486)
- [Add support for global plugin-defined
templates](https://github.com/erlang/rebar3/pull/1473)
- [catch badarg exception from eunit in
`rebar_prv_eunit`](https://github.com/erlang/rebar3/pull/1472)

a no-op provider that depends on lock that is slightly more discoverable and user friendly

The provider is used for debugging to help displaying current rebar's state.

Usage:
  rebar3 state