login into msco lab can be more user friendly

[Joern Ungermann]

• after having a typo in the username/password, both entries are removed from the testbox and have to be fully typed again
• It should be possible to configure default user/password from JSON configuration
• password should be hidden/hideable

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[Reimar Bauer]

Made mscolab login more user-friendly

• Added config parameters for default login/password
• hide password after typing (qt feature)
• do not remove login details after wrong login attempt

fix issue #486

→ <<cset ca438339c11c>>