Add MKS electrical monitoring support

[maddavo]

Fixes #60

Summary

Add Systems Monitor electrical support for MKS/USI modules that are not represented by the stock module names.

Changes

• Add ModuleHeatPumpPowerHandler, using the existing active-radiator power handling for MKS ModuleHeatPump parts.
• Register ModuleHeatPump as an electrical consumer in the radiator category.
• Register USI_Converter and USI_Harvester for electrical monitoring.
• Re-read converter and harvester recipes when calculating values so MKS selected bay/loadout data is reflected in editor planning and flight monitoring.
• Include the matching compiled plugin binary.

Verification

• Tested in KSP with MKS parts; the Systems Monitor reports the expected electrical generation and consumption.
• Release build completed successfully with zero errors.
• The existing upstream compiler warnings are unchanged.
• Compared with upstream master: five files changed.