advance enableRawMode() before getColumns()

For some reason, the old code was always cleaning the maximum number of
rows used so far while editing in multi line mode. Actually we need to
clean just the number of rows used by the last line. The old behavior
created problems in multiplexing mode, where the line is refreshed at a
different row, if the user used linenoiseHide() / show() in order to
print something. With the new behavior, all looks fine, so far.

Fix compilation in non C99/C11 mode.

fix masking input when there is no hintsCallback

Signed-off-by: lifubang <lifubang@acmcoder.com>

add mask input mode

Signed-off-by: lifubang <lifubang@acmcoder.com>

Set seq to empty string if color/bold not used

Update README.markdown

Fix little typo

Otherwise the subsequent abAppend will concatenate whatever junk data
is in seq to ab

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=832460.

This patch was kindly contributed by Chris Lamb (@lamby).

Linenoise is used in multiple projects for enough time, let's tag this
commit with a version number as requested into issue #88, so that we
have an initial reference.

Given the nature of the library, the version was also added in the
linenoise C and header file as well so that it is easy to realize for
people having a copy embedded somewhere if they are using the latest
version.

However the files linenose.c and linenose.h already had inline licenses.

This makes sure that if we are editing in multi-line mode a line that
actually spawns across multiple lines, the next output performed by the
application using linenoise will not overwrite the edited line.

OSX default Terminal app does not handle 999D well, the cursor will wrap
back to the previous row in the last colum, instead of ignoring the
sequence if the cursor is already at the left edge.

In order to avoid reintroducing the nG sequence that is not compatible
with base VT100 emulation and ANSI.SYS, we use CR that should be
hopefully widely supported.