feat(GridFire): major design changes

Switching to an Engine + solver design. Also brought xxHash and Eigen in. Working on QSE and Culling.

src/network/meson.build

@@ -1,8 +1,10 @@
 # Define the library
 network_sources = files(
     'lib/network.cpp',
-    'lib/approx8.cpp',
-    'lib/netgraph.cpp'
+    'lib/engine/engine_approx8.cpp',
+    'lib/engine/engine_graph.cpp',
+    'lib/reaction/reaction.cpp',
+    'lib/solver/solver.cpp',
 )
 
 
@@ -13,7 +15,9 @@ dependencies = [
     composition_dep,
     reaclib_reactions_dep,
     cppad_dep,
-    log_dep
+    log_dep,
+    xxhash_dep,
+    eigen_dep,
 ]
 
 # Define the libnetwork library so it can be linked against by other parts of the build system
@@ -33,7 +37,10 @@ network_dep = declare_dependency(
 # Make headers accessible
 network_headers = files(
     'include/gridfire/network.h',
-    'include/gridfire/approx8.h',
-    'include/gridfire/netgraph.h',
+    'include/gridfire/engine/engine_abstract.h',
+    'include/gridfire/engine/engine_approx8.h',
+    'include/gridfire/engine/engine_graph.h',
+    'include/gridfire/reaction/reaction.h',
+    'include/gridfire/solver/solver.h',
 )
-install_headers(network_headers, subdir : 'gridfire/gridfire')
+install_headers(network_headers, subdir : 'gridfire')