Fix review points

- Fix headers hierarchy
- Improve accessibility:
 	- set mouse pointer
	- make rows focusable
	- open on key press
	- add tooltip with "title"
	- add role and aria attributes
- Rename `ParsedLog` to `ParsedLogLine`
- Add docs to `ReversedFileReader`'s implementation of `Iterator`'s methods
- Add docs to `ParsedLogIterator`'s implementation of `Iterator`'s methods
- Remove unnecessary comment
- Add more test for parsing log lines and fix some edge cases
- Fix function name in snake-case to camelCase
- Remove `DIRECTORY_SEPARATOR`

view/theme/frio/css/style.css

@@ -98,6 +98,13 @@ details summary {
 	display: list-item;
 }
 
+/**
+ * clickable table rows
+ */
+.table > tbody > td[role="button"] {
+	cursor: pointer;
+}
+
 /**
  * mobile aside
  */