Centralize SecExp unit stat calculations

devTools/FC.ts

js/003-data/gameVariableData.js

src/Mods/SecExp/SecExpBackwardCompatibility.tw

src/Mods/SecExp/attackHandler.tw

src/Mods/SecExp/attackOptions.tw

src/Mods/SecExp/attackReport.tw

src/Mods/SecExp/buildings/secBarracks.tw

src/Mods/SecExp/edicts.tw

src/Mods/SecExp/js/Unit.js

src/Mods/SecExp/js/secExp.js

src/Mods/SecExp/rebellionHandler.tw

src/Mods/SecExp/securityReport.tw

src/Mods/SecExp/seeUnit.tw

src/Mods/SecExp/widgets/battleWidgets.js

src/Mods/SecExp/widgets/miscSecExpWidgets.tw

src/events/intro/initNationalities.js