Trigger uniques by sacrificing units with conditional (#6157)

* Triggered uniques currently come from researching techs, adopting policies, and building buildings.
This adds a third way of triggering uniques, by attaching them to units with a "by consuming this unit" conditional, which will be added as a possible unit action.
So for example, "[amount] Free Technologies <by consuming this unit>", "Reveals the entire map <by consuming this unit>" etc.

* Added a new uniquetype for triggerable uniques, to make them separate from regular global uniques, so that triggerable uniques can become unit uniques when necessary

* And added translations so the tests will pass

tests/src/com/unciv/testing/TranslationTests.kt

@@ -65,7 +65,7 @@ class TranslationTests {
             val key = if (entry.contains('[')) entry.replace(squareBraceRegex, "[]") else entry
             if (!translations.containsKey(key)) {
                 allStringsHaveTranslation = false
-                println(entry)
+                println("$entry not translated!")
             }
         }
         return allStringsHaveTranslation