enum TiminMode same as in slsDetectorPackage (#360)

**BugFix: **
- enum TimingMode same as in slsDetectorPackage 
- supports reading all timing modes from RawMasterFile

src/to_string.cpp

@@ -35,9 +35,15 @@ template <> DetectorType string_to(const std::string &arg) {
 
 template <> TimingMode string_to(const std::string &arg) {
     if (arg == "auto")
-        return TimingMode::Auto;
+        return TimingMode::AUTO_TIMING;
     if (arg == "trigger")
-        return TimingMode::Trigger;
+        return TimingMode::TRIGGER_EXPOSURE;
+    if (arg == "gating")
+        return TimingMode::GATED;
+    if (arg == "burst_trigger")
+        return TimingMode::BURST_TRIGGER;
+    if (arg == "trigger_gating")
+        return TimingMode::TRIGGER_GATED;
     throw std::runtime_error("Could not decode timing mode from: \"" + arg +
                              "\"");
 }