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Add ctrl+z as undo (if allowed by terminal, hopefully)

--- a/README.md

+++ b/README.md

@@ -67,7 +67,7 @@

 - `A`-`Z`, `a`-`z`, `0`-`9`, and other printable characters: write character to grid at cursor

 - Spacebar: play or pause

 - `ctrl+f`: step the simulation one tick forward

-- `ctrl+u`: undo

+- `ctrl+z` or `ctrl+u`: undo

 - return or enter: change into or out of overwrite/append mode

 - `/`: change into or out of key-trigger mode (for the `!` operator)

 - `[` and `]`: Adjust cosmetic grid rulers horizontally

--- a/tui_main.c

+++ b/tui_main.c

@@ -1093,9 +1093,11 @@

   // ncurses state consistent, at the cost of less responsive terminal

   // interrupt. (This will rarely happen.)

   intrflush(stdscr, FALSE);

-  // Receive keyboard input immediately, and receive shift, control, etc. as

-  // separate events, instead of combined with individual characters.

-  // raw();

+  // Receive keyboard input immediately without line buffering, and receive

+  // ctrl+z, ctrl+c etc. as input instead of having a signal generated. We need

+  // to do this even with wtimeout() if we don't want ctrl+z etc. to interrupt

+  // the program.

+  raw();

   // Don't echo keyboard input

   noecho();

   // Also receive arrow keys, etc.

@@ -1212,6 +1214,7 @@

     case KEY_RIGHT:

       app_move_cursor_relative(&app_state, 0, 1);

       break;

+    case AND_CTRL('z'):

     case AND_CTRL('u'):

       app_input_cmd(&app_state, App_input_cmd_undo);

       break;