Fix password input handling on Linux

The password input handling on Linux to match the behavior on Windows.
It allows deleting characters using the Backspace, Delete, and
Left arrow keys, and correctly handles other input sequences are handling
correctly.

src/Cedar/Console.c

@@ -1938,6 +1938,7 @@ bool PasswordPrompt(char *password, UINT size)
 		c = _getch();
 #else	// OS_WIN32
 		c = getc(stdin);
+PROCESS_CH:
 #endif	// OS_WIN32
 
 		if (c >= 0x20 && c <= 0x7E)
@@ -1952,6 +1953,7 @@ bool PasswordPrompt(char *password, UINT size)
 		else if (c == 0x03)
 		{
 			// Break
+			RestoreConsole(console);
 			exit(0);
 		}
 		else if (c == 0x04 || c == 0x1a || c == 0x0D || c==0x0A)
@@ -1977,7 +1979,47 @@ bool PasswordPrompt(char *password, UINT size)
 				goto BACKSPACE;
 			}
 		}
-		else if (c == 0x08)
+#ifdef OS_UNIX	// OS_UNIX
+		else if (c == 0x1B)
+		{
+			c = getc(stdin);
+			if (c != 0x5B && c != 0x4F)
+			{
+				// ESC key
+				goto PROCESS_CH;
+			}
+
+			c = getc(stdin);
+			if (c == 0x44)
+			{
+				// Left arrow key
+				goto BACKSPACE;
+			}
+			else if (c == 0x33)
+			{
+				c = getc(stdin);
+				if (c == 0x7E)
+				{
+					// Delete key
+					goto BACKSPACE;
+				}
+			}
+
+			// Drain remaining sequence bytes (most are <= 6)
+			for (int i = 0; i < 6; i++)
+			{
+				if (c >= 0x40 && c <= 0x7E)
+				{
+					// End of sequence
+					break;
+				}
+				c = getc(stdin);
+			}
+
+			continue;
+		}
+#endif	// OS_UNIX
+		else if (c == 0x08 || c == 0x7F)
 		{
 BACKSPACE:
 			// Backspace