- Added AES-ECB to man page recommendations
- Minor fix in README recommendations table

Now that there is an SSE and an AVX implementation,
there is no need to have an scalar implementation for Chacha20.

Initial Chacha20 AVX512 implementation done using XMM registers
only, handling only 64 bytes at a time.

Add N buffer functions for ZUC EEA3/EIA3,
which utilize the internal ZUC functions using
GFNI and VAES instructions.

Optimize ZUC internal functions by using the upcoming
GFNI/VAES instructions, alongside AVX512.

Due to the usage of the new GFNI instructions,
the minimum required version of NASM has been updated
from 2.13.03 to 2.14.

There are some public enums that are conflicting
with other enums defined in other libraries, due to
too generic naming.
In order to solve this issue, existing enums will be renamed.

In order to maintain backwards compatilibity for the next few
releases, the previous enums will be maintained,
so existing applications will not be broken.

A new compilation flag, NO_COMPAT_IMB_API_053, is added.
The previous enums can be removed if this compilation flag
is set (which is disabled by default), when building and linking
applications.

For applications which use various libraries, this flag
should be set, so no redefinition of enums will take place, by
passing -DNO_COMPAT_IMB_API_053 to its CFLAGS (or EXTRA_CFLAGS).

- Added README.md
- Updated existing README with output generated by pandoc
- Added README target to Makefile to create/update README using pandoc

Change-Id: I2f93fa56c2d528efe12ba31ad28d269cabe14f43