Add a new method that iterates over all the promise values (i.e. `Sequence<T>`) and filters the sequence to another using the given `filterer` function. If `filterer` returns `true`, a copy of the item is put in the `output` sequence, otherwise, the item will not appear in `output`. Also provide a static helper to directly filter values (`QtPromise::filter(values, filterer)`).
Iterate over all the promise value (i.e. `Sequence<T>`) and map the sequence to another using the given `mapper` function. Also provide a static helper to directly map values (`QtPromise::map(values, mapper)`).
Split the root README.md in multiple Markdown files (in the `docs/` folder) to make easier reading, editing and extending the documentation. An online version is also available on netlify (https://qtpromise.netlify.com). Building it requires Node.js installed, then:
- npm install -g gitbook-cli
- gitbook install ./
- gitbook build . dist/docs
