Reload logger config in shell

This requires some fancy dynamic work since the logger is started as
part of the kernel and we lost the sys.config from users when working
from there.

We start conservatively by making it an optional thing, turning it on
only where we know it to be safe.

The changes are applied _after_ having loaded the rest of configs so if
an inoffensive error happens, the shell works (with a bad error message)
rather than plain exploding.

add report in the effects_code_generation, as it is the short form for both report_errors and report_warnings

Friendlier output on include_lib errors

Turns output like this:

    ===> Compiling apps/c/src/c.erl failed
    apps/c/src/c.erl:3: can't find include lib "parse_trans/include/codegen.hrl"

Into:

    ===> Compiling apps/c/src/c.erl failed
    apps/c/src/c.erl:3: can't find include lib
    "parse_trans/include/codegen.hrl"; Make sure parse_trans is in your app
    file's 'applications' list

Which is likely going to help newcomers encountering issues.

Bump certifi

fixed typo erl_first_files

Includes an update to parse_trans on an OTP-21 friendly version

smarter shell code reloading, add env options for refresh_paths & refresh_paths_blacklist

Warn but succeed when atoms are passed to erl_first_files

otp21 eperm fix for local install/upgrade, no need to set uid/gid

otp-21 eperm fix: bump of erlware_commons and relx

- Introduce support of add and del operations for overrides
 - OTP-21 compatibility
 - Bump cth_readable for OTP-21 compat
 - upgrade relx to 3.25.0
 - upgrade bbmustache to 1.5.0
 - run compile provider in default namespace from bare compiling (fixes
   hooks for mix builds)
 - Resolve string vs list crashing rebar3 in erl_first_files
 - Create ERLANG_LIB_*_erl_interface environment variables only if erl_interface exists
 - Add hooks to the upgrade command
 - Add --start-clean flag to rebar3 shell
 - Auto-boot main app in OTP app project templates
 - Use maps for child spec examples in templates
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Merge tag '3.6.0' into refresh_paths

Bump to 3.6.0

- Introduce support of add and del operations for overrides
- OTP-21 compatibility
- Bump cth_readable for OTP-21 compat
- upgrade relx to 3.25.0
- upgrade bbmustache to 1.5.0
- run compile provider in default namespace from bare compiling (fixes
  hooks for mix builds)
- Resolve string vs list crashing rebar3 in erl_first_files
- Create ERLANG_LIB_*_erl_interface environment variables only if erl_interface exists
- Add hooks to the upgrade command
- Add --start-clean flag to rebar3 shell
- Auto-boot main app in OTP app project templates
- Use maps for child spec examples in templates

Add OTP-21.0 to Travis

Bump cth_readable for OTP-21 compat

Revert "upgrade certifi to 2.3.1"

upgrade relx to 3.25.0

upgrade certifi to 2.3.1

upgrade bbmustache to 1.5.0

Finish adding specs for private funs in rebar3.erl

- added type specs for following private functions:
    - run/1
    - set_options/2
    - test_state/1
    - safe_define_test_macro/1
    - test_defined/1

run compile provider in default namespace from bare

Resolve string vs list crashing rebar3

- resolves #1645

Create ERLANG_LIB_*_erl_interface environment variables only if erl_interface exists

Introduce support of add and del operations under erl_opts directive

Add hooks to the upgrade command

Add --start-clean flag to rebar3 shell

Allows override of apps specified in other on-disk options. Equivalent
to `--apps=""`

Fixes #1785

As requested in #1733