常量本版本新增

NEconomy|ECONOMICAL_BASE_GROWTH_LONG_TERM_YEARS

NEconomy|ECONOMICAL_BASE_GROWTH_LONG_TERM_YEARSloading_screen/common/defines/00_defines.txt:1851

years back for long-term eco growth rate

定义loading_screen/common/defines/00_defines.txt:1851