feat(reaclib): working on building efficient reaclib tooling for general nuclear network

this commit primarily adds a more robust ability to cull reactions that are not needed from the generated header

assets/static/atomic/meson.build

@@ -1,4 +1,15 @@
+required_headers = [
+    'atomicSpecies.h',
+]
+
+foreach h : required_headers
+    if not cpp.has_header(h, include_directories: include_directories('include'))
+        error('SERiF requires the header file ' + h + ' to be present in the assets/static/atomic/include directory.')
+    endif
+endforeach
+
 species_weight_dep = declare_dependency(
     include_directories: include_directories('include'),
 )
+
 message('✅ SERiF species_weight dependency declared')