logic: added C/C++ project setup from Code::Blocks

* also changed xml elements in sourcegroup settings that specify the used language standard, so that one sourcegroup can maintain multiple language standards
* added migration and migrated sample projects

bin/app/user/projects/javaparser/javaparser.srctrlprj

@@ -17,6 +17,7 @@
 	</description>
     <source_groups>
         <source_group_7a9e75fc-2cad-42d5-8c5b-c86d02f7b4e4>
+            <java_standard>8</java_standard>
             <name>Javaparser Source Group</name>
             <source_extensions>
                 <source_extension>.java</source_extension>
@@ -25,11 +26,10 @@
                 <source_path>./src/main/java</source_path>
                 <source_path>./target/generated-sources/javacc</source_path>
             </source_paths>
-            <standard>8</standard>
             <status>enabled</status>
             <type>Java Source Group</type>
             <use_jre_system_library>1</use_jre_system_library>
         </source_group_7a9e75fc-2cad-42d5-8c5b-c86d02f7b4e4>
     </source_groups>
-    <version>6</version>
+    <version>7</version>
 </config>

bin/app/user/projects/tictactoe/tictactoe.srctrlprj

@@ -2,6 +2,7 @@
 <config>
     <source_groups>
         <source_group_afdfade2-4b42-49a6-961a-d4a563f2cf84>
+            <cpp_standard>c++2a</cpp_standard>
             <cross_compilation>
                 <target>
                     <abi>unknown</abi>
@@ -21,10 +22,9 @@
             <source_paths>
                 <source_path>./src</source_path>
             </source_paths>
-            <standard>c++2a</standard>
             <status>enabled</status>
             <type>C++ Source Group</type>
         </source_group_afdfade2-4b42-49a6-961a-d4a563f2cf84>
     </source_groups>
-    <version>6</version>
+    <version>7</version>
 </config>

bin/app/user/projects/tutorial/tutorial.srctrlprj

@@ -17,6 +17,7 @@
 	</description>
     <source_groups>
         <source_group_75041cb3-37c8-45c6-bb8a-1b8b79040f59>
+            <cpp_standard>c++2a</cpp_standard>
             <cross_compilation>
                 <target>
                     <abi>unknown</abi>
@@ -33,10 +34,9 @@
             <source_paths>
                 <source_path>./src</source_path>
             </source_paths>
-            <standard>c++2a</standard>
             <status>enabled</status>
             <type>C++ Source Group</type>
         </source_group_75041cb3-37c8-45c6-bb8a-1b8b79040f59>
     </source_groups>
-    <version>6</version>
+    <version>7</version>
 </config>