RTSU 1-41r38: One bug fix, two feature additions

 RTSU 1-41r38-40:

• Fixed error where Miloslav G-616.b Warp Engine (T,R,F) would not display correct name if chosen in build tab.
• Added ability to create custom plasma drive in the custom tab.
• Added ability to create custom warp drive in the custom tab.
• Fixed error where munitorium wasn't adding +1 to damage for the following weapons in the 4th Weapon Slot: Disruption Macrocannons, Disruption Macrocannon Broadside, Hecutor Pattern Plasma Battery, Hecutor Pattern Plasma Broadside, Stygies Pattern Macrocannons
• Fixed calculation error for leftover power and Craftsmanship 'Power' efficiencies on the BUILD sheet.
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