Fix .orig rename commands in bin_windows

1. .orig was being prepended second argument rather than appended to the
first argument

2. Windows' ren command expects the second argument to be just a file
name (not contain drive or path components)

3. Tidy up appending of .orig, place inside double quotes rather than
outside of quotes.

This matches the usage a few lines later:
@if exist "%rel_dir%\%rel_name%.boot" (

Copy rename commands from bin_windows to extended_bin_windows.

Any output string from .erlang to stdout will be prepend to
code:root_dir(), so it will cause the retrieved dir incorrect.

The fix is to start erl with the no_dot_erlang boot file.

The syntax for proper path handling when the path may contain
parentheses (such as C:\Program Files (x86)\...) requires quoting the
entire assignment expression:

    set "var=%val%"

any other way of doing it may interpret the parentheses and cause
failures.

The first run would correctly replace the environment
variables, however it would also overwrite the original
vm.args and sys.config thus preventing any further
substitution in subsequent runs.
Dev mode runs were also broken, all runs after the
first were required to also define the
RELX_REPLACE_OS_VARS variable in order not to
overwrite the current vm.args with the original one,
this prevented simply attaching to an already running
node that was started this way.

Add tests to exercise this functionality.

Fix for #478 Boot variable $ERTS_LIB_DIR not supplied in Windows scripts

Add missing -boot_var argument to Windows scripts when starting erlang.

Use different boot variables on Windows vs non-Windows.

The built-in $ROOT boot variable points to the erts directory on Windows
(dictated by erl.ini [erlang] Rootdir=) and so a boot variable $RELEASE_DIR
is made pointing to the release directory