[FIX] Add warning suppression to Quartus project for address latch timing

Since the address latch does not hazard the design timing, the Time Quest
warning can be ignored.

Change-Id: I73970bc7f8bbe5cbd3ed8406380bfe588b890d6e
[FEATURE] Add push buttons to TERASIC MN demo designs

Connect available push buttons to MN host processor.

Change-Id: I123a71ec19bc9974b6fd4a21efc9254755f34fbf
[FEATURE] Print error code to LCD

When the MN reaches NmtGsOff the last error code is forwarded to the LCD.

Change-Id: If6feb0c062ccc70f46abdf0acc4592c1dedec249
[FEATURE] Enhance demo_mn_embedded to execute NMT commands on key push

- KEY0 executes SwReset
- KEX1 executes SwitchOff

Change-Id: I93729b99340cca5568353eeb4cd597625a4247b5