more font_size to a new config file for session data

We need config and session data.
config is what the user changes. Only read by the app.
session is what the app remembers. Read and written by the app.

settingsstore.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from typing import Callable
 
 from settings import Settings
@@ -15,22 +16,42 @@ class SettingsStore():
     def _config_file() -> str:
         return join(Path.home(), ".ravenlog", "settings.ini")
 
+    @staticmethod
+    def _session_file() -> str:
+        if sys.platform == 'win32' or sys.platform == 'cygwin':
+            return join(Path.home(), "AppData", "Local", "ravenlog", "session.ini")
+        else:
+            return join(Path.home(), ".local", "share", "ravenlog", "session.ini")
+
     @staticmethod
     def load() -> Settings:
+
+        config = SettingsStore._load_config()
+        session = SettingsStore._load_session()
+        return Settings(config, session)
+
+    @staticmethod
+    def _load_config() -> ConfigParser:
         config_file = SettingsStore._config_file()
         config = ConfigParser()
+        config.read(config_file)
+        return config
+
+    @staticmethod
+    def _load_session() -> ConfigParser:
+        session_file = SettingsStore._session_file()
+        session = ConfigParser()
 
         # apply default settings
-        config.add_section('general')
-        config.set('general', 'font_size', '12')
-        config.read(config_file)
-
-        return Settings(config)
+        session.add_section('general')
+        session.set('general', 'font_size', '12')
+        session.read(session_file)
+        return session
 
     @staticmethod
     def save(settings: Settings):
-        config_file = SettingsStore._config_file()
-        dir = os.path.dirname(config_file)
+        session_file = SettingsStore._session_file()
+        dir = os.path.dirname(session_file)
         os.makedirs(dir, exist_ok=True)
-        with open(config_file, 'w+') as fp:
-            settings.config.write(fp)
+        with open(session_file, 'w+') as fp:
+            settings.session.write(fp)