Pre-release 1.2.3 alpha 2

Pre-release changes:

• [Change] Minor code adjustments to compile under KSP 1.1
• [Change] Disable animation on 4-way light since it doesn't work properly anyways.
• [Change] Rename GUI action and event names in 4-way light to identify which light they control.
• [Internal] Create a multipoint light modulde and use it in 4-2ay light.
• [Internal] Migrate spot and omny lights to the stock LightModule.
• [Internal] Drop incomplete SurfaceNavLight module.
• [Internal] Drop unused SurfaceLight module.