Implement SecNum for building DMG

[AMXBus]

A folowup SecNum implementation to the building HP data

Main things to note:

• We implement SecNum calls in the runtime intit structure for the yard props and their respective properties (YARD_PROPS.as/OUTPOST_YARD_PROPS.as/INFERNOYARDPROPS.as)
• These areas get called for use as basic data and calculations in some building scripts (BUILDINGN.as - dps reduction calculations), WMATTACK.as (dps calculation) and other scripts like BFOUNDATION.as, BTOWER.as (Description data) and are covered by Get() methods where needed (this corelates with hp data)
• The internal math is simple and most of it happens as an attack is happening and has SecNum implementation in a few areas
• Almost the same as the HP data but it's called a few more times.