Added the "KEvent" console command. (#17)

This PR adds a new console command, "KEvent", which allows the sending of arbitrary events to the [state machine](https://ktag.clubk.club/Technology/SystemK/#state-machine).  The events are specified by [ID](https://git.ktag.clubk.club/Software/SystemK/src/tag/SystemK_v01.01/Events/KEvents.h#L33-L86), which may change from release-to-release of SystemK.

```
KTag> KEvent
Usage:
  KEvent <Event ID> <Event Data>
  (Note that IDs may be SystemK version-dependent.)
```

Co-authored-by: Joe Kearney <joe@clubk.club>
Reviewed-on: #17

components/Serial_Console/Console.c

@@ -21,11 +21,13 @@
  */
 
 #include "esp_console.h"
+#include <KEvent_Command.h>
 #include <Log_Command.h>
 #include <System_Command.h>
 
 static void register_commands()
 {
+    Register_KEvent_Command();
     Register_Log_Command();
     Register_System_Command();
     esp_console_register_help_command();