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14 Add hold_clk_wait to ALU CFL latch

This correctly delays latching the C-Flag for CCF instruction when
nWAIT was asserted at that instruction's M1/T2 cycle

UART: fixed two synthesis warnings		 gdevic 2891d 03h /a-z80/
13 Full support for nWAIT during M1 and memory cycles
This set of changes fixes issues with nWAIT signal
Updated reg control, resets, ir modules to handle delay
This correctly delays clearing of IR if the nWAIT was asserted at
the very first M1 cycle
Simplify decode_state to use discrete write enable for CB/ED flags
Gate CB/ED write with hold_clk_wait to enable nWAIT delay
genfuse add code to test nWAIT insertion at M1
Add host wait state circuitry from Zilog manual (wait_state.*)
Add wait test code to basic fpga/modelsim models
Select from 3 options to test wait states:
- no wait state inserted (nWAIT=1)
- insert a wait state to every M1 cycle
- insert a wait state to each memory access cycle
zxspectrum: Add custom NMI handler and a function to enter game pokes after pressing the NMI button
zxspectrum: Corrected bits 7,5 when reading ULA port 254
zxspectrum: Fix the shift key repeat bug
When using additional keys (<,>,?,...) and shift was released before
a symbol, it would repeat. This change fixes that by correctly resetting
keyboard mask state bitfields.
Added new data pins module for Lattice toolset
It has been reported that "data_pins.v" does not compile on Lattice
toolset and this variation of the code has been proposed and verified
by a user.
Fixed M1 during reset
Memory_ifc module set M1 to inactive (high) during nRESET
Exported wait_m1 signal from that module as a testpoint		 gdevic 2892d 00h /a-z80/
12 Explicitly set python to execute within a batch file gdevic 2904d 16h /a-z80/
11 zxspectrum improvements:

- Added ZX Spectrum ROM mods as described in the blog:
http://www.baltazarstudios.com/zx-spectrum-rom-mods
This mod allows NMI interrupt to break into a special
handler code inside the ROM image and let the user
type a POKE address (5 decimal digits) + value (3
decimal digits) to modify a memory location
- Changed default joystick pins to Atari style joystick
as described in the blog
- Added a timing constraints file		 gdevic 3117d 01h /a-z80/
10 zxspectrum: Various improvements

- Fixed keyboard bug (by Bogdan S.)
- Minor comment changes
- Renamed reset to nreset		 gdevic 3162d 16h /a-z80/
9 Updated documentation gdevic 3163d 10h /a-z80/
8 z80: Release 4 gdevic 3163d 12h /a-z80/
7 z80: Fixing repeating INIR/OTIR class of instructions gdevic 3227d 16h /a-z80/
6 Added deployment folder with all files needed to use the CPU
Changed ZX Spectrum project to use deployment files as example
Changed extension for Verilog include files from *.i to *.vh
Updated documentation; added section on file generators
Minor corrections and fixes to various files		 gdevic 3578d 02h /a-z80/
5 zxspectrum: Various improvements

- Added "Turbo" speed mode switch (SW2)
- Turbo speed is (3.5 MHz x 2 = 7.0 MHz)
- LEDG5 lits when a key is being pressed
- LEDG6 blinks when a speaker/line-in is being toggled

Misc:
- Fixed a false clock for ula:beep
- Fixed unused Kempston input warning
- Updated documentation to 1.1		 gdevic 3607d 16h /a-z80/
4 - Removed files that are left in the root folder gdevic 3613d 16h /a-z80/
3 - New directory structure
- Added documentation files (and PDF versions)
- Fixed tests		 gdevic 3613d 17h /a-z80/
2 Initial import of the A-Z80 project files. gdevic 3619d 16h /a-z80/
1 The project and the structure was created root 3619d 23h /a-z80/

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