Clean up repository - remove unnecessary files and folders

Removed:
- TODO.md (old todo list, can use GitHub Issues instead)
- tests/ (minimal test coverage, not actively maintained)
- docs/ (mostly empty documentation files)
- contributing/ (redundant with .github/contributing.md)
- appimage/ (AppImage-specific files, only needed for AppImage builds)

Kept essential files:
- .gitignore (required for Git)
- .gitmodules (required for submodules)
- LICENSE (legal requirement)
- README.md (project documentation)
- .github/ (workflows, templates, community files)
- Dockerfile (Docker support)

Repository now has clean, minimal structure with only necessary files.

tests/test_split_artists.py

@@ -1,137 +0,0 @@
-import unittest
-
-def split_artists(src: str, separators: set[str], ignoreList: set[str] = set()):
-    """
-    Splits a string of artists into a list of artists, preserving those in ignoreList.
-    Case-insensitive matching is used for the ignoreList.
-    """
-    result = []
-    current = ""
-    i = 0
-    
-    # Convert ignoreList to lowercase for case-insensitive matching
-    ignore_lower = {artist.lower() for artist in ignoreList}
-    
-    while i < len(src):
-        # Check if any ignored artist starts at this position (case-insensitive)
-        ignored_match = next(
-            (
-                src[i:i+len(ignored)] 
-                for ignored in ignoreList 
-                if src.lower().startswith(ignored.lower(), i)
-            ), 
-            None
-        )
-        
-        if ignored_match:
-            # If we have accumulated any current string, add it to result
-            if current.strip():
-                result.extend([a.strip() for a in current.split(',') if a.strip()])
-                current = ""
-            # Add the ignored artist to the result (preserving original case)
-            result.append(ignored_match)
-            # Move past the ignored artist
-            i += len(ignored_match)
-        elif src[i] in separators:
-            # If we encounter a separator, process the current string
-            if current.strip():
-                result.extend([a.strip() for a in current.split(',') if a.strip()])
-                current = ""
-            i += 1
-        else:
-            # If it's not an ignored artist or a separator, add to current
-            current += src[i]
-            i += 1
-    
-    # Process any remaining current string
-    if current.strip():
-        result.extend([a.strip() for a in current.split(',') if a.strip()])
-    
-    return result
-
-
-class TestSplitArtists(unittest.TestCase):
-
-    def test_basic_splitting(self):
-        self.assertEqual(
-            split_artists("Beatles, Queen; Rolling Stones", {";"}),
-            ["Beatles", "Queen", "Rolling Stones"],
-        )
-
-    def test_multiple_separators(self):
-        self.assertEqual(
-            split_artists("Beatles; Queen & Rolling Stones | ABBA", {";", "&", "|"}),
-            ["Beatles", "Queen", "Rolling Stones", "ABBA"],
-        )
-
-    def test_ignore_list(self):
-        self.assertEqual(
-            split_artists(
-                "Beatles; Earth, Wind & Fire; Queen", {";", "&"}, {"Earth, Wind & Fire"}
-            ),
-            ["Beatles", "Earth, Wind & Fire", "Queen"],
-        )
-
-    def test_empty_string(self):
-        self.assertEqual(split_artists("", {";"}), [])
-
-    def test_only_separators(self):
-        self.assertEqual(split_artists(";;;", {";"}), [])
-
-    def test_extra_spaces(self):
-        self.assertEqual(
-            split_artists("  Beatles  ;  Queen  ", {";"}), ["Beatles", "Queen"]
-        )
-
-    def test_comma_splitting(self):
-        self.assertEqual(
-            split_artists("Beatles, Queen; Rolling Stones, ABBA", {";"}),
-            ["Beatles", "Queen", "Rolling Stones", "ABBA"],
-        )
-
-    def test_ignore_list_with_comma(self):
-        self.assertEqual(
-            split_artists(
-                "Beatles; Earth, Wind & Fire, Queen", {";"}, {"Earth, Wind & Fire"}
-            ),
-            ["Beatles", "Earth, Wind & Fire", "Queen"],
-        )
-
-    def test_ignore_list_with_separator(self):
-        self.assertEqual(
-            split_artists("Beatles; AC/DC", {"/", ";"}, {"AC/DC"}), ["Beatles", "AC/DC"]
-        )
-
-    def test_ignore_list_at_start(self):
-        self.assertEqual(
-            split_artists("AC/DC; Beatles", {"/", ";"}, {"AC/DC"}), ["AC/DC", "Beatles"]
-        )
-
-    def test_ignore_list_at_end(self):
-        self.assertEqual(
-            split_artists("Beatles; AC/DC", {"/", ";"}, {"AC/DC"}), ["Beatles", "AC/DC"]
-        )
-
-    def test_multiple_ignored_artists(self):
-        self.assertEqual(
-            split_artists(
-                "Beatles; AC/DC; Guns N' Roses; Queen",
-                {"/", ";", "'"},
-                {"AC/DC", "Guns N' Roses"},
-            ),
-            ["Beatles", "AC/DC", "Guns N' Roses", "Queen"],
-        )
-
-    def test_bob_marley(self):
-        self.assertEqual(
-            split_artists(
-                "Bob marley & The wailers; Beatles",
-                {";", "&"},
-                {"Bob marley & the wailers"},
-            ),
-            ["Bob marley & The wailers", "Beatles"],
-        )
-
-
-if __name__ == "__main__":
-    unittest.main()