Move common/misc/hmp.c -> common/misc/hmp.cpp
Move common/misc/ignorecase.c -> common/misc/ignorecase.cpp
Move common/misc/strio.c -> common/misc/strio.cpp
Move common/misc/strutil.c -> common/misc/strutil.cpp
Move common/texmap/ntmap.c -> common/texmap/ntmap.cpp
Move common/texmap/scanline.c -> common/texmap/scanline.cpp
Move common/texmap/tmapflat.c -> common/texmap/tmapflat.cpp
Move common/ui/button.c -> common/ui/button.cpp
Move common/ui/checkbox.c -> common/ui/checkbox.cpp
Move common/ui/dialog.c -> common/ui/dialog.cpp
Move common/ui/file.c -> common/ui/file.cpp
Move common/ui/gadget.c -> common/ui/gadget.cpp
Move common/ui/icon.c -> common/ui/icon.cpp
Move common/ui/inputbox.c -> common/ui/inputbox.cpp
Move common/ui/keypad.c -> common/ui/keypad.cpp
Move common/ui/keypress.c -> common/ui/keypress.cpp
Move common/ui/keytrap.c -> common/ui/keytrap.cpp
Move common/ui/listbox.c -> common/ui/listbox.cpp
Move common/ui/menu.c -> common/ui/menu.cpp
Move common/ui/menubar.c -> common/ui/menubar.cpp