Feature: Smart Filtering: local & remote filters + colorized output

[alacasta]

What?

This contribution fixex #57 and #59 and gathers old #60 and #58

The contribution includes

• A new checkbox to enable the filtering remotely or in the client side
• The modification of the non-matching logging to light-gray
• The creation of a colorized filter

Colorized output

To create a filter

• Add a new text in the filterbox
• Click on Set Color and a color-picker will be open with a random color (see screenshot)
• Select your preferred color
• Click on Filter

Result

In case of having the remote filter enabled, the filter is made in remote

If in turn, thhe remote filter is disabled, the filter is made locally and the non-matching lines are displayed in gray

[alacasta]

Hello @pentix
Now seems that docker image comes with Qt 5.12

I propose you again to reconsider merging this feature but please, if you prefer to not add features from >= Qt 5.9.5, i can try to remove the dependency comming from QRandomGenerator

Let me know :)