Resolve "Duniter listens to [::]:8888 even if not asked by BMA/GVA/WS2P"

Closes #1431

See merge request !1401

Resolve "`sync` uses too much RAM, even without GVA enabled"

Closes #1430

See merge request !1400

feat(docker): build and install dex

See merge request !1397

deps: include gva module in x86_64 arch only

See merge request !1398

#1426: Allow a wider range of Node.js versions and document dependencies to build

Closes #1426

See merge request !1394

Replace yum with dnf
Fix markdown

Introduce https://crates.io/crates/version-compare
Allow Node.js version between 10.18.0 and 11.0.0
https://nodejs.org/en/download/releases/

Currency params and main wot access

See merge request !1395

`P2pCandidate.dlPromise` promise doesn't resolve on download errors
such as socket timeouts. Each time such an error occurs, the node is lost
for the sync because the 'this.dlPromise.isResolved()' check used for
testing the node's availability never succeeds anymore for this node.

This patch hardens the blocks downloading in two ways:
* Retrying the download up to 5 times when the number of returned blocks is
  different from what was requested
* On failure returns an empty block array so that the dlPromise is resolved
  and the node failure could be handled as expected at the P2PSyncDownloader
  level triggering the `P2pCandidate.addFailure()` function.