DOSBox-X beta 2018-02-05 2339 Windows asynchronous window handling hack

• New code to force 3Dfx OpenGL initial state to use GL_SMOOTH shading
• Linux/X11 bug fixes, including detection of Visual format change and code to keep the window on the screen even during SDL video mode changes
• PC-98: EGC bit shifter fixes and corrections. Screen shake in Touhou Project is emulated correctly now without errors
• PC-98: It turns out that the "page flipping" bit in PC-98 hardware is NOT double buffered and changes take effect immediately, therefore tearlines caused by page flipping mid-frame are normal. However, a hack to delay page flipping to vertical retrace to possibly alleviate tearlines is available.
• Fixed 3Dfx OpenGL code to prevent resizing at all costs including removal of the minimize button in the Windows title bar area
• Added code to disable (gray out) menu bar items that are not available while 3Dfx OpenGL emulation is running.
• Windows: Fatal errors (E_Exit) now display a message box in addition to sending to stderr, so that users who run the game without the command prompt can know what went wrong instead of DOSBox-X just disappearing suddenly from the desktop.
• New titlebar= dosbox.conf option to replace the running program name with a user defined string, if desired. (emendelson)
• New dosbox.conf option to control whether the Windows menu bar is initially visible.
• Fixed Windows builds to use SDL's system WM events instead of fighting the SDL message pump over menu (WM_COMMAND) events.
• dosbox.reference.conf now uses MS-DOS (CR LF) line endings so that it can be edited on Windows systems using NOTEPAD.EXE