Add local HLS dev setup: clangd, pragma highlighting + linting, local C-sim

Practicals/practical-3b/game_of_life_practical3b/hls_config.cfg

@@ -0,0 +1,10 @@
+part=xc7z010clg400-1
+
+[hls]
+flow_target=vivado
+package.output.format=ip_catalog
+package.output.syn=false
+tb.file=testbench.cpp
+syn.file=gameoflife.cpp
+syn.file=gameoflife.h
+syn.top=game_of_life_step