Make it so more entries can be added to the kTechId table without replac...

...ing TechTreeConstants.lua (for supporting other mods)


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This updates Elixer_Utility to more smartly append entries to kTechId, and updates kTechIdMax to allow as many entries as possible without increasing the bitcount on the network messages. Without this change in TechTreeConstants.lua, it is impossible to add new values.