FIX: checkKey now throw named errors

ADD: textEncrypt and textDecrypt to read and write cesium+ messages.

FIX: no more import "crypto" from browser

FIX: import artefact generating error in browser
FIX: finish dictionary-tree skipped test
FIX: timeout start in multi-node-layer.test to have more deterministic test result

FIX: remove ambiguous isPubkey ( a deprecated version of isPubKey )

DOC: french CHANGELOG.fr.md updated

ADD: isPubKey checkKey and return true or false (instead of throwing error)
FIX: checkKey allow key without checksum (and perform internal check on them)
FIX: checkKey allow binary key as input

v3.2.0 is previous commit. This-one will be v3.3.0 if all work like espected.

crypto: test if it's pubkey

See merge request !1

ADD : CheckKey
FIX : B64

ADD: crypto.sign(str, secretKey,outputFormat='b64') return only hash, in b64 by default.
ADD: crypto.rawSign(uint8Array, rawSeed) return raw hash.