plugin/pkiller: improve kill-all option

- better title, add count of matches in subtitle, use process icon
- hide option when executable path is empty

Author: JohnTheGr8

Plugins/Flow.Launcher.Plugin.ProcessKiller/Languages/en.xaml

@@ -5,7 +5,8 @@
     <system:String x:Key="flowlauncher_plugin_processkiller_plugin_name">Process Killer</system:String>
     <system:String x:Key="flowlauncher_plugin_processkiller_plugin_description">Kill running processes from Flow Launcher</system:String>
 
-    <system:String x:Key="flowlauncher_plugin_processkiller_kill_all">kill all "{0}" processes</system:String>
+    <system:String x:Key="flowlauncher_plugin_processkiller_kill_all">kill all instances of "{0}"</system:String>
+    <system:String x:Key="flowlauncher_plugin_processkiller_kill_all_count">kill {0} processes</system:String>
     <system:String x:Key="flowlauncher_plugin_processkiller_kill_instances">kill all instances</system:String>
 
 </ResourceDictionary>

Plugins/Flow.Launcher.Plugin.ProcessKiller/Main.cs

@@ -89,6 +89,7 @@ private List<Result> CreateResultsFromProcesses(List<ProcessResult> processlist,
                     SubTitle = path,
                     TitleHighlightData = StringMatcher.FuzzySearch(termToSearch, p.ProcessName).MatchData,
                     Score = pr.Score,
+                    ContextData = p.ProcessName,
                     Action = (c) =>
                     {
                         processHelper.TryKill(p);
@@ -101,14 +102,14 @@ private List<Result> CreateResultsFromProcesses(List<ProcessResult> processlist,
 
             // When there are multiple results AND all of them are instances of the same executable
             // add a quick option to kill them all at the top of the results.
-            var firstResult = sortedResults.FirstOrDefault()?.SubTitle;
-            if (processlist.Count > 1 && !string.IsNullOrEmpty(termToSearch) && sortedResults.All(r => r.SubTitle == firstResult))
+            var firstResult = sortedResults.FirstOrDefault(x => !string.IsNullOrEmpty(x.SubTitle));
+            if (processlist.Count > 1 && !string.IsNullOrEmpty(termToSearch) && sortedResults.All(r => r.SubTitle == firstResult?.SubTitle))
             {
                 sortedResults.Insert(1, new Result()
                 {
-                    IcoPath = "Images/app.png",
-                    Title = string.Format(_context.API.GetTranslation("flowlauncher_plugin_processkiller_kill_all"), termToSearch),
-                    SubTitle = "",
+                    IcoPath = firstResult?.IcoPath,
+                    Title = string.Format(_context.API.GetTranslation("flowlauncher_plugin_processkiller_kill_all"), firstResult?.ContextData),
+                    SubTitle = string.Format(_context.API.GetTranslation("flowlauncher_plugin_processkiller_kill_all_count"), processlist.Count),
                     Score = 200,
                     Action = (c) =>
                     {