Escape key can raise Abort

[petereon]

Changes:

• Included config option Config.raise_on_escape
• Included Abort exception containing the key which caused it to be raised
• Extended select to raise Abort on escape if Config.raise_on_escape is True
• Extended select_multiple to raise Abort on escape if Config.raise_on_escape is True
• Extended prompt to raise Abort on escape if Config.raise_on_escape is True
• Extended confirm to raise Abort on escape if Config.raise_on_escape is True

Addresses #50

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