feat(srd): allow srd searches by flight level

Previously, you had type in the full altitude. Now it assumes that any altitude <1000 is a flight
level, and thus performs the conversion.

fix VATSIM-UK#358

resource/UKControllerPlugin.rc

@@ -190,7 +190,7 @@ BEGIN
     EDITTEXT        IDC_SRD_DESTINATION,98,24,71,14,ES_UPPERCASE | ES_AUTOHSCROLL
     LTEXT           "Destination Fix or Airfield*",IDC_SRD_DESTINATION_STATIC,7,27,85,8
     EDITTEXT        IDC_SRD_CRUISE,98,43,72,14,ES_AUTOHSCROLL | ES_NUMBER
-    LTEXT           "Requested Cruise Altitude",IDC_SRD_CRUISE_STATIC,7,46,84,8
+    LTEXT           "Cruising Altitude or Level",IDC_SRD_CRUISE_STATIC,7,46,80,8
     LTEXT           "* Required Field",IDC_STATIC_REQUIRED,213,27,52,8
     CONTROL         "",IDC_SRD_RESULTS,"SysListView32",LVS_REPORT | LVS_SINGLESEL | LVS_SHOWSELALWAYS | LVS_EDITLABELS | LVS_ALIGNLEFT | WS_BORDER | WS_TABSTOP,7,85,295,90
     DEFPUSHBUTTON   "Search",IDC_SRD_SEARCH,59,61,50,14

src/plugin/srd/SrdSearchDialog.cpp

@@ -211,8 +211,12 @@ namespace UKControllerPlugin {
             SendDlgItemMessage(hwnd, IDC_SRD_CRUISE, WM_GETTEXT, 255, reinterpret_cast<LPARAM>(&cruiseBuffer));
             std::string requestedLevel = UKControllerPlugin::Hold::ConvertFromTchar(cruiseBuffer);
 
-            if (requestedLevel != "") {
+            // If the requested level is < 100, assume it's a flight-level
+            if (requestedLevel.empty()) {
                 searchParams.requestedLevel = std::stoi(requestedLevel);
+                if (searchParams.requestedLevel < 1000) {
+                    searchParams.requestedLevel *= 100;
+                }
             }
 
             // Clear the results list and notes box