Addind 7GUIs examples (https://eugenkiss.github.io/7guis/). Currently implemented the first three: Counter, Temperature Converter and Flight Booker.
Fixes in IgnoreMatcher and ProjectDirectoryTree.
Window::runMainLoop now accepts an std::function<void()>, this allows to use lambdas with captures.
UITextInput when using only numbers allow to insert + and - at the beggining of the number.
Return Node* on Node::setFocus().
String::fromFloat and String::fromDouble will shrink the number as much as possible (delete extra 0 and .).