update doxygen configuration (#2720)

* remove MAX_DOT_GRAPH_DEPTH

* set RECURSIVE yes

* Exclude directories

doxygen.config

@@ -9,6 +9,8 @@ FILE_PATTERNS          = *.c \
                          *.h \
                          *.inc \
                          *.md
+RECURSIVE              = YES
+EXCLUDE                = ./build ./3rdParty ./CMake
 
 GENERATE_LATEX         = NO
 WARNINGS               = YES
@@ -27,9 +29,6 @@ HTML_COLORSTYLE_GAMMA  = 200
 CALL_GRAPH             = YES
 CALLER_GRAPH           = YES
 
-# all.h includes everything and everything inclues it so the graph is usless past depth 1
-MAX_DOT_GRAPH_DEPTH    = 1
-
 # Not all files are documented yet
 EXTRACT_ALL            = YES