Add Kore hardfork block to chainConfig & homi

[ian0371]

Proposed changes

• Add a field ChainConfig.KoreCompatibleBlock
• homi supports --kore-compatible-blocknumber

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• Bugfix
• New feature or enhancement
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Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[2dvorak]

LGTM