Remove use_filesystem_cache and additional_dynamic_modules, it hasn't been implemented for a long time

CHANGELOG.rst

@@ -31,6 +31,9 @@ Changelog
   has reached the end of its life and now it's just about a smooth transition.
 - Removed ``settings.no_completion_duplicates``. It wasn't tested and nobody
   was probably using it anyway.
+- Removed ``settings.use_filesystem_cache`` and
+  ``settings.additional_dynamic_modules``, they have no usage anymore. Pretty
+  much nobody was probably using them.
 
 0.15.2 (2019-12-20)
 +++++++++++++++++++

jedi/settings.py

@@ -23,7 +23,6 @@ Filesystem cache
 ~~~~~~~~~~~~~~~~
 
 .. autodata:: cache_directory
-.. autodata:: use_filesystem_cache
 
 
 Parser
@@ -38,7 +37,6 @@ Dynamic stuff
 .. autodata:: dynamic_array_additions
 .. autodata:: dynamic_params
 .. autodata:: dynamic_params_for_other_modules
-.. autodata:: additional_dynamic_modules
 .. autodata:: auto_import_modules
 
 
@@ -71,11 +69,6 @@ Removed it again, because in VIM that is not very practical.
 # Filesystem cache
 # ----------------
 
-use_filesystem_cache = True
-"""
-Use filesystem cache to save once parsed files with pickle.
-"""
-
 if platform.system().lower() == 'windows':
     _cache_directory = os.path.join(os.getenv('APPDATA') or '~', 'Jedi',
                                     'Jedi')
@@ -133,12 +126,6 @@ dynamic_params_for_other_modules = True
 Do the same for other modules.
 """
 
-additional_dynamic_modules = []
-"""
-Additional modules in which |jedi| checks if statements are to be found. This
-is practical for IDEs, that want to administrate their modules themselves.
-"""
-
 dynamic_flow_information = True
 """
 Check for `isinstance` and other information to infer a type.

test/test_settings.py

@@ -23,17 +23,6 @@ def test_auto_import_modules_imports(auto_import_json, Script):
     assert isinstance(main._name, CompiledValueName)
 
 
-def test_additional_dynamic_modules(monkeypatch, Script):
-    # We could add further tests, but for now it's even more important that
-    # this doesn't fail.
-    monkeypatch.setattr(
-        settings,
-        'additional_dynamic_modules',
-        ['/foo/bar/jedi_not_existing_file.py']
-    )
-    assert not Script('def some_func(f):\n f.').complete()
-
-
 def test_cropped_file_size(monkeypatch, get_names, Script):
     code = 'class Foo(): pass\n'
     monkeypatch.setattr(