Should be able to add custom patterns without recompiling the tool

[ImrePyhvel]

Currently the tool only supports a fixed set of patterns. Even a trivial change would require making a fork of the tool, implementing the change in c#, recompile & redeploy.

We should improve this by making configuration more flexible, for example by using some marker replacement technique in user-given input.

For example:
one should be able to state that InformationalVersion should be:
"This is my fancy thingy {major}.{minor}, release {configuration}". Curly parts would be replaced with runtime values on each build.

[ImrePyhvel]

Done,

supports fixed custom parts and replaceable tokens (using Nortal.Utilities.TextTemplating library).

To release in 0.11.0.