Up to now was used in internal ROOT methods, but now can be reused 
to modify already prepared http reply in RWebWindow

Page normally read from file system, but could be modified depending on
special WSHandler functionality. Will be used in RWebWindow

Deprecate old signature, but keep support for a while

Otherwise it can not be correctly override in derived classes

No idea why all separate time methods were introduce, but fraction was
missing

add Get/SetTimestamp function with TTimeStamp class to work with microseconds; bug fixed: writing date/time in local time to PostgreSQL but returning in UTC (different values), kBindStringSize was not enough for timestamp with microseconds

Will be used in different plugins to modify delivered web page

This could be used to insert specialized information, which is related
to WS handler or display engine like CEF/Qt5

Co-authored-by: Jan Knedlik <j.knedlik@gsi.de>

Co-authored-by: Jan Knedlik <j.knedlik@gsi.de>

Websocket handler can allow to access file from local system, where main
HTML page is located.

Use new locations

Now default location for JSROOT is <prefix>/js
For Openui5 files is <prefix>/ui5

CRYPTLIBS was for crypt, not OpenSSL's crypto. Fix R__NO_CRYPTO by
dropping it altogether and using only the setting for 'ssl'. Also,
move CMakeLists.txt to use new coding style.

There seems to be a confusion between crypt(3) and crypto(7) here.
The crypt function is defined in unistd.h and is used for password
and data encryption, while crypto is OpenSSL's library implementing
cryptographic algorithms used in Internet standards.

crypt  - https://www.unix.com/man-page/all/3C/crypt
crypto - https://www.openssl.org/docs/man1.1.1/man7/crypto.html