Erlang reltool utility functionality application

`ex2erl` is an escript that converts Elixir source code to Erlang source code
which is useful when relying only on Erlang compilation with Erlang source code
that would like to include Elixir source code.

`release` is an escript which provides the same basic functionality as
`rebar generate`, with additional error reporting coming from the reltool OTP
source code which rebar suppresses.

`scope` is an escript which moves your Erlang application dependencies
into their own "scope", so in Erlang, this means that it adds a prefix to
the application name and all the modules used by the application.  The general
sequence of operations you would want to use with the scope script are: 

  1. use the `-r` replace mode to modify internal source code, 
  2. modify the internal source code manually, if necessary, 
  3. run the `scope` script normally before compilation, 
  4. if it is necessary to return the source back to the original state, use the `-u` undo mode to remove the scoped source code and replace it with the original source code.  The `scope` script is meant to be part of a build process so the dependency modifications are automatic.

For the sequence above to work properly all dependencies must have a
unique prefix in their file names (both erl and hrl files).
If a file name is not unique (like log.hrl or protocol.hrl), unrelated
source code may be modified to cause bugs.

Example arguments for normal operation are: `-s cloudi_x_ -p cloudi -b _original -d directory1 -d directory2`. 
Dependencies that use `include_lib` require that the dependency directory name is 
changed to have the scope, but the script can still add/remove the scope to the
application and module names normally.

The `reltool_util` source code provides a simple way to start an Erlang
application manually, outside of a release (which is useful when regression
testing requires that an application be started, especially if the tests are
part of a build process like `rebar eunit` or `rebar ct`).


Michael Truog (mjtruog at protonmail dot com)


* Hans Bolinder (ex2erl utf8 encoding)


MIT License