Added shortcuts to step more instructions

Holding Ctrl modifies multiplies the 10/100/1000 step keys by 1000 for even
larger steps. These can be handy when narrowing down emulation issues.

Base/Debug.cpp

@@ -450,14 +450,16 @@ void View::SetAddress(uint16_t wAddr_, bool /*fForceTop_*/)
 
 bool View::cmdNavigate(int nKey_, int nMods_)
 {
+    auto ctrl = (nMods_ == HM_CTRL);
+
     switch (nKey_)
     {
     case HK_KP7:  cmdStep(1, nMods_ != HM_NONE); break;
-    case HK_KP8:  cmdStepOver(nMods_ == HM_CTRL); break;
+    case HK_KP8:  cmdStepOver(ctrl); break;
     case HK_KP9:  cmdStepOut();     break;
-    case HK_KP4:  cmdStep(10);      break;
-    case HK_KP5:  cmdStep(100);     break;
-    case HK_KP6:  cmdStep(1000);    break;
+    case HK_KP4:  cmdStep(ctrl ? 10'000 : 10);      break;
+    case HK_KP5:  cmdStep(ctrl ? 100'000 : 100);     break;
+    case HK_KP6:  cmdStep(ctrl ? 1'000'000 : 1000);    break;
 
     default:      return false;
     }

ReadMe.md

@@ -494,9 +494,9 @@ Disassembly View:
         Keypad-7 = single step 1 instruction
         Keypad-8 = step over instruction
         Keypad-9 = step out of function
-        Keypad-4 = step 10 instructions
-        Keypad-5 = step 100 instructions
-        Keypad-6 = step 1000 instructions
+        Keypad-4 = step 10 instructions (10000)
+    Keypad-4/5/6 = step 10/100/1000 instructions
+    Ctrl-KP4/5/6 = step 10K/100K/1M instructions
    Ctrl-Keypad-8 = step over with code timing (no ints, border contention)
       Left/Right = scroll 1 byte
          Up/Down = scroll 1 instruction