Allow open multiple table (MariaDB)

[ghkamfung]

Is your feature request related to a problem? Please describe.
It is common scenario more than one table need to be open at the same time for schema compare or data compare/copy.

Describe the solution you'd like
In order of preference

1. Allow open more than one table and display two tab side-by-side. Similar to NotePad++ (Move to other view)
   
2. Provide a short cut "Open new instance" and automatically login to the same database in a new HeidiSQL Windows.
3. Allow open more than one table. Tab can be same as now.

Describe alternatives you've considered
Also allow open table in different database. Sometimes we restore a backup and want to compare with current database.

Additional context
Add any other context or screenshots about the feature request here.

[ansgarbecker]

Related and competing: #1682 and #1070