Feature: custom table format (long text, timestamp, etc.)

[orionlee]

Allows developers to specify custom formatting on per table/column level, which can be used support:

• display of long text (limit max-width of the column and truncate the text), one way for Impractical with a lot of text in database #31
• display timestamp (unix epoch in long) in human-readable format
• human-friendly display of floating point numbers, e.g., limit to 2 decimal places.

See the changes in ExampleApp.java for usage.

[reisub]

@orionlee Hi Sam, great idea and thanks for taking the time to contribute, we'll review as soon as we can.

[orionlee]

The codes are stable enough for review now.

[bojankoma]

After long and careful deliberation, I'll have to respectively decline this PR.
Reasoning behind this decision is that I don't want DbInspector to process what is written down in database in any way.
Taking that responsibility and guaranteeing that content is correct is not in the scope of this library.
However, I do recognise the need to represent data in a more human readable manner.
There is an issue already open on this subject and we can continue to discuss how to approach and solve this problem.
Thank you for your interest and work, I do hope to see some more.