This allows interested parties to receive notifications on media
changes. This is demonstrated by the file manager and media image
information menus now updating immediately if the system ejects a
mounted image, or a mounted image is changed by a script or something.
ui/filemngr.cpp, ui/info.cpp: Update file manager and media image
information menus immediately on media image changes.
ui/menu.cpp: Return index of added item from item_append.
bus/generic/slot.cpp: Use out-of-line virtual destructors to avoid
vtable link errors in certain single-driver builds.
bus/nubus: Tidy up some #include statements.
sega_beena_cart.xml: Put page scans in individual data areas.
frontend/mame/luaengine_mem.cpp: Added a raw read function for memory
regions.
plugins/layout: Added bitmap classes to layout sandbox.
* docs: Added option for Wayland support to compiling guide.
* docs: Clarified behaviour of memory region read/write methods.
* Fixed some editing errors in Turkish UI translation.
* Added some parentheses on ternary conditional operators for clarity.
Also corrected some copy/paste errors in documentation, and bumped
documentation version as it now describes features that will appear in
an upcoming release.
