Stardew Valley: Refactor skill progression to use new feature system (#3662)

* create a first draft of the feature

* use feature in items and locations

* add content to more places

* use feature in logic

* replace option check by feature

* remove unused code

* remove weird white space

* some import nitpicking

* flip negative if

worlds/stardew_valley/content/feature/skill_progression.py

@@ -0,0 +1,46 @@
+from abc import ABC, abstractmethod
+from typing import ClassVar, Iterable, Tuple
+
+from ...data.skill import Skill
+
+
+class SkillProgressionFeature(ABC):
+    is_progressive: ClassVar[bool]
+    are_masteries_shuffled: ClassVar[bool]
+
+    @abstractmethod
+    def get_randomized_level_names_by_level(self, skill: Skill) -> Iterable[Tuple[int, str]]:
+        ...
+
+    @abstractmethod
+    def is_mastery_randomized(self, skill: Skill) -> bool:
+        ...
+
+
+class SkillProgressionVanilla(SkillProgressionFeature):
+    is_progressive = False
+    are_masteries_shuffled = False
+
+    def get_randomized_level_names_by_level(self, skill: Skill) -> Iterable[Tuple[int, str]]:
+        return ()
+
+    def is_mastery_randomized(self, skill: Skill) -> bool:
+        return False
+
+
+class SkillProgressionProgressive(SkillProgressionFeature):
+    is_progressive = True
+    are_masteries_shuffled = False
+
+    def get_randomized_level_names_by_level(self, skill: Skill) -> Iterable[Tuple[int, str]]:
+        return skill.level_names_by_level
+
+    def is_mastery_randomized(self, skill: Skill) -> bool:
+        return False
+
+
+class SkillProgressionProgressiveWithMasteries(SkillProgressionProgressive):
+    are_masteries_shuffled = True
+
+    def is_mastery_randomized(self, skill: Skill) -> bool:
+        return skill.has_mastery