Add the bioauth parameters to the chain spec client extension

[tonycdot]

Resolves #116.
To do:

• Fix problem with extension deserialization
• Test peer

[tonycdot]

Test:

ChainSpec	CLI arguments	Result
no changes	no changes	works
new fields robonodeUrl, webappUrl	no changes	works
new fields robonodeUrl, webappUrl	without --webapp-url and --robonode-url	works
no changes	without --webapp-url and --robonode-url	no QR code
new fields, corrupted	no changes	works
new fields, corrupted	without --webapp-url and --robonode-url	got Error: Service(Other("relative URL without a base"))