(menu_common_backend.c) Refactor duplicate code
(Menu/Disp) Fix core name representation
(RMenu) Build fix
(Menu) menu_entries.c - Cast file_type to menu_file_type_t
Revert "(Settings data) refactor setting_data_*_setting functions"

This reverts commit 4438f7373207b54bc57db1c623fded59a6b94881.
Merge pull request #969 from lakkatv/glui

(GLUI) GL based RGUI display driver clone
(GLUI) Fix disp_set_label