copy to clipboard for ascii text

Non ascii does not work yet. Code does not handle multi-byte characters.

logFileModel.py

@@ -12,6 +12,13 @@ class LogFileModel:
     def __init__(self, file):
         self._file = file
 
+    def read_range(self, start_byte: int, end_byte: int):
+        with self._lock:
+            with open(self._file, 'rb') as f:
+                f.seek(start_byte)
+                bytes = f.read(end_byte - start_byte)
+                return bytes.decode("utf8", errors="ignore")
+
     def data(self, byte_offset, scroll_lines, lines) -> List[Line]:
         #print("data(%s, %s, %s)" % (byte_offset, scroll_lines, lines))
         lines_before_offset: List[Line] = []