RepairRule as subclass to ProductionRule

[frigoref]

GameParser.java

• use method replace instead of replaceAll
• remove methods parseRepairCosts and parseRepairResults
• parseRepairRules to reuse methods parseCosts and parseResults

Production.java

• reverted in 2nd commit: let inner class RepairRule extend from inner class ProductionRule

ProductionRule.java

• make private fields protected for visibility after inheritance

RepairRule.java

• inherit from ProductionRule and remove duplicates

[frigoref]

@DanVanAtta Do you see a way to use still let inner class RepairRule extend from inner class ProductionRule (in Production.java)?
When I tried to the first commit only, there were XML parsing errors, that I couldn't get fixed without reverting the changes.