* Ported Stella to SDL2, which brings many new features. Among the largest improvements is native hardware acceleration support for Windows (Direct3D) and Linux/OSX (OpenGL). It is also now possible to port Stella to iOS and Android devices using OpenGLES. Hardware acceleration is now required, which means up-to-date drivers are needed. Software rendering is still present, but is somewhat unoptimized and unsupported going forward. * Fullscreen video modes now use the desktop resolution. Switching to fullscreen and back to windowed mode no longer rearranges icons on your desktop. * TIA TV effects are now available in all video modes, since hardware acceleration is a requirement. * Added a much more detailed view of cart extended RAM to a new debugger tab. Special thanks to SpiceWare for this implementation. * Added preliminary support for 'DASH' bankswitching scheme by A. Davie. * The AtariVox and SaveKey controllers now have the ability in the debugger to completely erase the virtual EEPROM data. * Added 'savesnap' debugger prompt command, and also associated context menu item to the debugger TIA output area. This saves the current TIA image to a PNG file. * Added 'hidecursor' commandline option, which allows to completely disable showing the mouse cursor (useful on systems that don't have a mouse). * Removed 'uipalette' option, as the original palette is no longer supported. * Updated included PNG library to latest stable version.