Uniformise the location of the back button across all interfaces, default and custom.
Uniformise the location of the title icon across all interfaces, default and custom.
Show the ISO 8601 date at which a saved state was created when displaying its screenshot.
The year is not 4-digit, so drop it from the date display of a saved state.
Saved state menu overhaul.

* Show the screenshot of the selected saved state even in the creation and deletion rows.
* In the saved state deletion interface, make the single state deletion go first.
* The screenshot of the latest saved state or the last selected one appears when the menu loads.
* The screenshot of the paused game appears when the menu is left.
Default to the first non-Back option in all menus for which the element count is known to always be non-zero. That excludes the recently played games menu.
Fix the date staying on-screen, blinking at 20 Hz, after showing a saved state.
Fix remanence of the last (few) digit(s) of a saved state's date if it contains one or more 1s.
Show the screenshot with timestamp after writing a state.
Modify the names of subdirectories in the TEMPGBA system directory as suggested on the TempGBA thread.
Release beta 1.
Actually look in the modified directory structure. Release beta 2.
Delete the right number of saved states when selecting one of the options.
Extract a 32 MiB ROM in a .zip to the system directory itself. That makes extracting work again, and doesn't leave an unsightly file in the ROM directory.
Reduce the rendering frequency to 65536 Hz and break older saved states again. 131072 Hz isn't necessary, and loading saved states made at 131072 Hz causes desynchronisation between PSG sound channels and the others.
Require and use the GBA BIOS in /TEMPGBA/gba_bios.bin.
Merge branch 'master' into poke-gba

Conflicts:
	Makefile
	README.md