[Feature] Add a new feature that allow user to insert extra solid infills (#10611)

* refactor Infill rotation template

* clean up comments

* set default solid_infill_rotate_template to empty

* Fix an issue that infill_direction solid_infill_direction not working as expected

* Add Extra Solid Infill Feature
Introduced a new feature to insert extra solid infills at specific layers for enhanced strength in 3D prints.

* fix doc error

* fix image name

* support "#K" for Explicit Layer List

* update wiki

src/libslic3r/Utils.hpp

@@ -681,6 +681,8 @@ void copy_directory_recursively(const boost::filesystem::path &source, const boo
 void save_string_file(const boost::filesystem::path& p, const std::string& str);
 void load_string_file(const boost::filesystem::path& p, std::string& str);
 
+bool check_layer_id_pattern(const std::string& pattern, int layer_id);
+
 } // namespace Slic3r
 
 #if WIN32