103.556MHz/1B10: Selectable font, UART Config

The default font has been changed to be terminus, the actual characters
used are not optimal and should be chosen from a better set, the font
itself can be selected from with the appropriate ANSI escape sequence.
This expands the size of the block RAM used from 4096 to 8192 (however,
each block RAM is in reality up to 18KiB in size, so there is more space
for extra fonts if needed).

Other improvements include:

* Adding 'delay' to the 'uart.vhd' package.
* Making the UART much more configurable
* Updating the simulators to account for the new registers
* Removing unneeded generics

Author: howerj

embed/embed.fth

@@ -860,7 +860,11 @@ h: (ok) state@ ?exit ."  ok" cr ;  ( -- : default state aware prompt )
 ( : ok <ok> @execute ; )
 h: preset tib-start #tib cell+ ! 0 in! id zero ;  ( -- : reset input )
 h: quite? 0 ; ( -- t : are we operating in quite mode? )
-: io! preset fallthrough;  ( -- : initialize I/O )
+: io! preset 
+  $36 $4012 ! ( set TX baud rate )
+  $32 $4014 ! ( set TX baud rate )
+  $8484 $4016 ! ( set UART control register; 8 bits, 1 stop, no parity )
+  fallthrough;  ( -- : initialize I/O )
 h: console ' rx? <key> ! ' tx! <emit> ! fallthrough;
 h: hand
    quite? 0= ' (ok) and