Add LiveCD recognition

Registered by Sergey "Shnatsel" Davidoff

Add support for recognizing if the script is ran from LiveCD, LiveUSB or from a full installation.
No language is set on boot from LiveCD, and we must allow greetings to adapt accordingly (e.g. flip through all the languages).

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Not started
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None
Priority:
Low
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None
Direction:
Approved
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None
Definition:
Review
Series goal:
None
Implementation:
Not started
Milestone target:
None

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