Added --filename-suffix and --filename-ext to flatc (#5778)

* Fixed refractoring issue in reflection/generate_code.sh. Also, mv deletes the original file, so I don't need to clean it up manually in that case.

* Added --filename-suffix and --filename-ext to flatc

* Fixed typo and added example generation of suffix and extension for C++

* Removed extra ;

* Removed clang-format block from a region that didn't need it. Fixed an auto format of another clang-format block

* Added docs, fixed pointer alignment, removed suffix test file

src/idl_parser.cpp

@@ -3231,8 +3231,8 @@ Offset<reflection::Field> FieldDef::Serialize(FlatBufferBuilder *builder,
       // Is uint64>max(int64) tested?
       IsInteger(value.type.base_type) ? StringToInt(value.constant.c_str()) : 0,
       // result may be platform-dependent if underlying is float (not double)
-      IsFloat(value.type.base_type) ? d : 0.0,
-      deprecated, required, key, attr__, docs__);
+      IsFloat(value.type.base_type) ? d : 0.0, deprecated, required, key,
+      attr__, docs__);
   // TODO: value.constant is almost always "0", we could save quite a bit of
   // space by sharing it. Same for common values of value.type.
 }