Also made error messages for missing CHDs and missing files for software
parts using the image file loader show search paths, and changed the
(poorly named) bitbanger device to use the image file loader rather than
the ROM loader for software items.
* Moved common code for drawing about box, info viewer, and other text box menus to a base class; removed the last of the info viewer logic and the multi-line item hack from the base menu class.
* Added previous/next group navigation for general inputs and plugin input selection menus.
* Moved message catalog logic to lib/util, allowing osd and emu to use localised messages.
* Made the base menu class use the UI manager’s feature for holding session state rather than a static map and mutex.
* Improved menu event handling model, and fixed many issues, particularly with menus behaving badly when hidden/shown.
* Added better support for menus that don’t participate in the usual menu stack, like the menuless sliders and the save/load state menus.
* Made a number of menus refresh state when being shown after being hidden (fixes MT08121 among other issues).
* Fixed indication of mounted slot option in the slot option details menu.
* Improved appearance of background menus when emulation isn't running - draw all menus in the stack, and darken the background menus to make the edges of the active menu clearer.
* Fixed locale issues in -listxml.
-debugger: Made GUI debuggers more uniform.
* Added new memory view features to Win32 debugger.
* Fixed spelling of hexadecimal in Cocoa debugger and added decimal address option.
* Fixed duplicate keyboard shortcut in Cocoa debugger (Shift-Cmd-D was both new device window and 64-bit float format).
* Made keyboard shortcuts slightly more consistent across debuggers.
-plugins: Moved input selection menu and sequence polling code to a common library. Fixed the issue that prevented keyboard inputs being mapped with -steadykey on.
-docs: Started adding some documentation for MAME's internal UI, and updated the list of example front-ends.
-Regenerated message catalog sources. For translators, the new strings are mostly:
* The names of the inputs provided by the OS-dependent layer for things like fullscreen and video features. These show up in the user interface inputs menu.
* The names for automatically generated views. These show up in the video options menu - test with a system with a lot of screens to see more variants.
* The input macro plugin UI.
* A few format strings for analog input assignments.
* A few strings for the about box header.
