Parse dumpsys settings as per-record results

The `dumpsys settings` parser matched a single regex per line, which
truncated every value that spans more than one line and, when
`defaultSystemSet:` did not fall on the first line, left the trailing
`default:` metadata inside the value. It also keyed results by setting
name within a namespace, so a name recorded twice kept only the last row
and a row without a `pkg:` field was dropped entirely.

Replace it with a line loop that accumulates one record at a time and
splits the `key:value` fields once the whole record has been read.
Results become a list of records carrying the fields dumpsys prints:
namespace, user, _id, name, value, pkg, default and defaultSystemSet,
plus the per-setting change history. History timestamps are printed
without a year, so they are resolved against the "ending at:" time of
the section and serialized into the timeline. This shows which package
changed a security-relevant setting, and when.

The androidqf settings module shares this artifact, so it now emits the
same record shape.

tests/android_bugreport/test_bugreport.py

@@ -10,6 +10,7 @@ from mvt.android.modules.bugreport.dumpsys_appops import DumpsysAppops
 from mvt.android.modules.bugreport.dumpsys_getprop import DumpsysGetProp
 from mvt.android.modules.bugreport.dumpsys_packages import DumpsysPackages
 from mvt.android.modules.bugreport.dumpsys_receivers import DumpsysReceivers
+from mvt.android.modules.bugreport.settings import Settings
 from mvt.android.modules.bugreport.tombstones import Tombstones
 from mvt.common.module import run_module
 
@@ -93,6 +94,25 @@ class TestBugreportAnalysis:
         assert alert.event == malicious_receiver
         assert alert.matched_indicator.value == "com.android.services"
 
+    def test_settings_module(self):
+        m = self.launch_bug_report_module(Settings)
+        assert len(m.results) == 11
+
+        assert len(m.alertstore.alerts) == 1
+        assert "accessibility_enabled = 1" in m.alertstore.alerts[0].message
+
+        assert len(m.timeline) == 3
+        change = [
+            entry
+            for entry in m.timeline
+            if entry["timestamp"] == "2022-03-28 22:41:07.980000"
+        ][0]
+        assert change["event"] == "settings_change"
+        assert change["data"] == (
+            'secure setting "accessibility_enabled" changed from "0" to "1" '
+            "by com.example.helper"
+        )
+
     def test_tombstones_modules(self):
         m = self.launch_bug_report_module(Tombstones)
         assert len(m.results) == 2