New feature suggestion: Enrich syntax highlighting with rainbow braces

[financial-engineer]

Dear GPS developers!
Please add rainbow braces to Ada 2012 syntax highlighting in the 2017 release of GPS.
Rainbow braces are colorization of braces {}, brackets [] and parenthesis (), so language users visually see the corresponding matching brace. As braces are enclosed inside one another, the color changes, so the depth of the expression can be easily seen by language users.

Usage example (in C# from Microsoft Visual Studio):

From my experience I can tell you that it is a pleasure to code with rainbow braces.