First approach documenting state machines

src/logic/unload_filament.cpp

@@ -1,4 +1,40 @@
 /// @file unload_filament.cpp
+///@dot
+///digraph architecture {
+///    graph [fontname=Helvetica, fontsize=10];
+///    node [shape=record, fontname=Helvetica, fontsize=10];
+///    edge [fontname=Helvetica, fontsize=10];
+///    compound=true;
+///    subgraph cluster_unload_filament { label="unload_filament"
+///         reset;
+///         UnloadFilament [ URL="\ref logic::UnloadFilament"];
+///         finda_FilLoadState [ shape=diamond, label="FINDA && FilLoadState"];
+///         return [shape="oval"];
+///         UnloadingToFinda [ URL="\ref logic::UnloadingToFinda", shape=diamond];
+///         ErrorFSnotOFF [shape=oval];
+///         ErrorFINDAnotOFF [shape=oval];
+///         RetractingFromFinda [shape=diamond];
+///         DisengagingIdler [shape=diamond];
+///         ERRDisengagingIdler [shape=hexagon];
+///         Finished [shape=oval];
+///         {rank = same; finda_FilLoadState; return;}
+///         {rank = same; ErrorFSnotOFF; UnloadingToFinda; ErrorFINDAnotOFF;}
+///         {rank = same; DisengagingIdler; ERRDisengagingIdler;}
+///    }
+///    reset -> finda_FilLoadState
+///    finda_FilLoadState -> return [label="NO && < 2"];
+///    finda_FilLoadState -> UnloadFilament [label="YES && >=2"];
+///    UnloadFilament -> UnloadingToFinda;
+///    UnloadingToFinda -> ErrorFSnotOFF [label="err"];
+///    UnloadingToFinda -> ErrorFINDAnotOFF [label="err"];
+///    UnloadingToFinda -> RetractingFromFinda;
+///    RetractingFromFinda -> ErrorFINDAnotOFF [label="err"];
+///    RetractingFromFinda -> DisengagingIdler;
+///    DisengagingIdler -> ERRDisengagingIdler [label="err"];
+///    DisengagingIdler -> Finished;
+///}
+///@enddot
+
 #include "unload_filament.h"
 #include "../modules/finda.h"
 #include "../modules/fsensor.h"