perf(thread saftey): All Engines are now thread safe

Previously engines were not thread safe, a seperate engine would be
needed for every thread. This is no longer the case. This allows for
much more efficient parallel execution

meson.build

@@ -35,11 +35,15 @@ subdir('src')
 # Build the Python bindings
 subdir('build-python')
 
-# Buil the test suite
+# Build the test suite
 subdir('tests')
 
+# Build the tool suite
 subdir('tools')
 
+# Build the benchmark suite
+subdir('benchmarks')
+
 # Build the pkg-config file
 subdir('build-extra/pkg-config')