Doxygen: enable export static for flight firmware

Since this is mostly documentation for us, documenting the internal
static methods is quite useful.

Author: peabody124

Doxygen/flight_doxygen.cfg

@@ -370,7 +370,7 @@ EXTRACT_ALL            = YES
 # If the EXTRACT_PRIVATE tag is set to YES all private members of a class 
 # will be included in the documentation.
 
-EXTRACT_PRIVATE        = NO
+EXTRACT_PRIVATE        = YES
 
 # If the EXTRACT_PACKAGE tag is set to YES all members with package or internal 
 # scope will be included in the documentation.
@@ -380,7 +380,7 @@ EXTRACT_PACKAGE        = NO
 # If the EXTRACT_STATIC tag is set to YES all static members of a file 
 # will be included in the documentation.
 
-EXTRACT_STATIC         = NO
+EXTRACT_STATIC         = YES
 
 # If the EXTRACT_LOCAL_CLASSES tag is set to YES classes (and structs) 
 # defined locally in source files will be included in the documentation.