Create Zynq demo using the latest Vitis tools (#746)

* Add hello world project for Vitis.

* Working hello world program.

* Remove the call to ps7_init().

* Demo moved from the XSDK project to Vitis is now compiling - not tried running yet though.

* Blink is printing out in blinky demo.

* Adjust the priorities of the demo tasks to enable them to run at once.
Update blocktim.c so it stores the line on which an error was detected in the error occurred variable rather than just setting the variable to true.

* Add launch configuration file.
Remove unused definitions from FreeRTOSConfig.h.
Edit the comments that describe what the demo does.

* Revert changes to blocktim.c, which should have been in a separate PR.

* Correct header comments in new files.

* Update headers for core checks.

* Third attempt at getting headers through the commit checks - copy headers from other files is not enough.

* Still trying to get core checks to pass.

* Update lexicon.txt

* Correct spelling in Cortex-A9 QEMU main.c.

Co-authored-by: none <>

.github/scripts/core_checker.py

@@ -43,6 +43,7 @@ FREERTOS_IGNORED_EXTENSIONS = [
     '.cdkws',
     '.cfg',
     '.cgp',
+    '.checksum',
     '.cmake',
     '.cmd',
     '.config',
@@ -204,6 +205,7 @@ FREERTOS_IGNORED_EXTENSIONS = [
     '.sig',
     '.sln',
     '.spec',
+    '.sprj',
     '.stf',
     '.stg',
     '.suo',
@@ -274,7 +276,12 @@ FREERTOS_IGNORED_FILES = [
     '.editorconfig',
     'lcovrc',
     'htif.c', 'htif.h',
-    'ethernetif.c'
+    'ethernetif.c',
+    'platform.c',
+    'platform.h',
+    'platform_config.h',
+    'FreeRTOS_asm_vectors.S'
+
 ]
 
 FREERTOS_HEADER = [