Further adjustments to health threshold checks

[Starkku]

@Metadorius

• Makes lower bound check of health threshold checks (weapon, warhead, crit) exclusive e.g equal to it does not satisfy the condition. This allows for creating distinct ranges for weapon/warhead eligibility e.g no overlapping.
• Ignore health threshold checks for objects with zero health. They are not relevant consideration for current health checks (other checks filter out unalive objects), if need to consider them in future appears, conditions can be added then and there.

Migration notice is currently absent due to uncertainty about where to place it.

[github-actions]

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