[ADD] killswitch

Son of Odinrequested to merge
killswitch into develop

This feature adds the ability for mimir to start to "kill" BEP2 and ERC20 rune forcing them to retire.

KillSwitchStart: Block height to start to kill BEP2 and ERC20 RUNE KillSwitchDuration: Duration (in blocks) until switching is deprecated

Edited by Heimdall

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