beta 2.0

* Fix CGA memory mapper.
* Switch the CPU clock at the timing of biu_done=1'b1.
* Modified to switch data sampling timing between Turbo mode and Normal…
* Modified CPU core to operate in turbo mode.
* Improved access timing to peripherals.
* Improved access speed to SDRAM.
* Memory map selection according to video mode
* Fix READY signals.
* Setting timings for tandy_16_gfx mode.
* Overscan removal.
* changed chipset clock to 50 mhz and rework.
* OSD menu update to accept HDD and FDD images.
* Added HQ2X and Gamma support.
* Add MiSTer Filters support (updated to latest framework)

SW/splash.txt

@@ -4,8 +4,8 @@
           ((_)()\ )\ /(_))( )(_))))\ )(    /(_)|((_)((_)\  ( )(_)) 
           (_()((_|(_|_)) (_(_())/((_|()\  (_)) )\_____((_)(_(_())  
           |  \/  |(_) __||_   _(_))  ((_) | _ ((/ __\ \/ /|_   _|  
-          | |\/| || \__ \  | | / -_)| '_| |  _/| (__ >  <   | |   beta 1.5
-          |_|  |_||_|___/  |_| \___||_|   |_|   \___/_/\_\  |_|  23/07/2022
+          | |\/| || \__ \  | | / -_)| '_| |  _/| (__ >  <   | |   beta 2.0
+          |_|  |_||_|___/  |_| \___||_|   |_|   \___/_/\_\  |_|  17/08/2022
 
 
                              Port by @spark2k06