refactoring and extending the support for FIFO and RR priority scheduling

• reworked the PriorityScheduler (FIFO)
• reworked the PriorityRoundRobinScheduler (RR) which now extends the PriorityScheduler with timeslicing and budgeting related features.
• added a new scheduler which extends the PriorityRoundRobinScheduler to offer both FIFO and RR scheduling policies that can be set per task.

.vscode/launch.json

@@ -82,21 +82,41 @@
             "console": "externalTerminal"
         },    
         {
-            "name": "RoundRobinSchedulingTicksOnly",
+            "name": "RoundRobinSchedulingTicksOnlyExample",
             "type": "cppvsdbg",
             "request": "launch",
-            "program": "${workspaceFolder}/build/examples/RoundRobinScheduling/Debug/RoundRobinSchedulingTicksOnly.exe",
-            "args": ["-o" "c:/tmp" "-t" "2000" "-r" "1" "2"],
+            "program": "${workspaceFolder}/build/examples/PriorityScheduling/Debug/RoundRobinSchedulingTicksOnly.exe",
+            "args": ["-o" "${workspaceFolder}/traces" "-t" "2000" "-r" "1" "2"],
             "stopAtEntry": false,
             "cwd": "${workspaceFolder}",
             "console": "integratedTerminal"
         },
         {
-            "name": "RoundRobinScheduling",
+            "name": "RoundRobinSchedulingExample",
             "type": "cppvsdbg",
             "request": "launch",
-            "program": "${workspaceFolder}/build/examples/RoundRobinScheduling/Debug/RoundRobinScheduling.exe",
-            "args": ["-o" "c:/tmp" "-t" "2000" "-r" "1" "2"],
+            "program": "${workspaceFolder}/build/examples/PriorityScheduling/Debug/RoundRobinScheduling.exe",
+            "args": ["-o" "${workspaceFolder}/traces" "-t" "2000" "-r" "1" "2"],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "console": "integratedTerminal"
+        },
+        {
+            "name": "PrioritySchedulingExample",
+            "type": "cppvsdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/build/examples/PriorityScheduling/Debug/PriorityScheduling.exe",
+            "args": ["-o" "${workspaceFolder}/traces" "-t" "2000" "-r" "1" "2"],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "console": "integratedTerminal"
+        },
+        {
+            "name": "PosixRealtimeSchedulingExample",
+            "type": "cppvsdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/build/examples/PriorityScheduling/Debug/PosixRealtimeScheduling.exe",
+            "args": ["-o" "${workspaceFolder}/traces" "-t" "2000" "-r" "1" "2"],
             "stopAtEntry": false,
             "cwd": "${workspaceFolder}",
             "console": "integratedTerminal"