Support Connect / Disconnect commands via msg

[Steve-Mcl]

Supports user "connect" and "disconnect" via msg - to permit runtime recovery in the event of error.

This is ground work for supporting runtime settable connection parameters at a later time.

Features:

• accepts topic : "command" + payload: "connect" or payload: "disconnect"
• updates all nodes status via a local event bus
• ensures pool is destroyed
• Updated en-US and zh-TW node built in help

Unit tests expanded - now has:

    ✔ should be loaded (876ms)
    ✔ should connect to database when topic and payload are set (49ms)
    ✔ should disconnect from database when topic and payload are set (1528ms)
    ✔ should perform a simple query (44ms)
    ✔ should return data to specified property
    ✔ should perform a simple using ui configured query with mustache (52ms)
    ✔ should can create table and insert/select data