Switch to new configuration file. Fix bug when finding window title.

config.py

@@ -1,9 +1,10 @@
 import json
+import os
 from typing import List
 from pydantic import BaseModel
 
 
-class BlockList(BaseModel):
+class Block(BaseModel):
     name: str = ''
     prefix: str = ''
     postfix: str = ''
@@ -11,14 +12,21 @@ class BlockList(BaseModel):
 
 
 class Config(BaseModel):
+    directory: str
+    blocks: List[Block]
+    start_as_user: bool = True
+    sleep_time: int = 1
+    focusfriend_py: str = "focusfriend.py"
+    window_names: str = "window_names.txt"
+
     class Config:
         extra = 'forbid'
 
-    blocklists: List[BlockList]
-
-
-def load_config(config_file: str) -> Config:
-    with open(config_file, 'r', encoding='utf8') as f:
-        config_dict = json.load(f)
-    return Config(**config_dict)
-
+    @classmethod
+    def load_config(cls, config_file: str) -> Config:
+        config_file = os.path.expanduser(config_file)
+        with open(config_file, 'r', encoding='utf8') as f:
+            config_dict = json.load(f)
+        config = cls(**config_dict)
+        config.directory = os.path.expanduser(config.directory)
+        return config