MNDR:
- remove inclusion of uneeded headers

MNDR:
- move the command factory to own file - mysqlnd_commands.c

MNDR:
- move all data members from MYSQLND_PFC to MYSQLND_PFC_DATA

MNDR:
- better name for MYSQLND_PPEC - MYSQLND_PFC (protocol frame codec)

MNDR:
- rename MYSQLND_NET to MYSQLND_PPEC (protocol packet envelope codec).
PPEC does only the encoding and decoding to the protocol frame.

MNDR:
- intermediate step to move MYSQLND_NET from mysqlnd_vio.c to mysqlnd_wireprotocol.c
In following commits MYSQLND_NET's methods and data will be moved to MYSQLND_PROTOCOL

MNDR:
- split MYSQLND_NET into MYSQLND_NET and MYSQLND_VIO
MYSQLND_NET is above MYSQLND_VIO. _NET takes care of protocol packet
counting (even with compressed), while VIO is just abou

MNDR:
- split MYSQLND_NET into MYSQLND_NET and MYSQLND_VIO
MYSQLND_NET is above MYSQLND_VIO. _NET takes care of protocol packet
counting (even with compressed), while VIO is just about the network
(or in case of windows, non-network, but PIPE) transport.

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MNDR:
- some small renaming of methods

MNDR:
- send_command and send_command_handle_response_* moved to a structure

MNDR:
- move connection establishment code to own command - COM_HANDSHAKE

MNDR:
- decouple the commands from the connection. CONN ist passed now only in 1 case

MNDR:
- remove dead code

MNDR:
- clean up some things

MNDR:
- move COM_INIT_DE result handling to the command

MNDR:
- remove COM_FIELD_LIST

MNDR:
- move handling of commands to the command itself

MNDR:
- split handle_response() into handle_OK and handle_EOF

MNDR:
- now send_command_handle_response() also doesn't depend directly on
MYSQLND_CONN_DATA

MNDR:
- pass connection closer and its context
- remove unused parameter

MNDR:
- rename the macro for updating the connection state

MNDR:
- make MYSQLND_ERROR_INFO a class

MDNR:
- make MYSQLND_UPSERT_STATUS more like an object that a simple structure
Still use macros to make updates simple

MNDR:
- abstract SSL enabling into COM_ENABLE_SSL

MDNR:
- Refactor the command factory. Let the factory be exchangeable.

MDNR:
- send_command() is no more, thus we need commands for all COM_STMT_*
+ CHANGE_USER