String safety (#1548)

* Array size UB fixes

* Fix ShieldD

* Remove (almost) all unsafe strcpy calls

Bunch of macros. C arrays are easy enough and just need a different call. For various cases where a char* is passed around bare, I've made a TEXT_SPAN macro that can store a length too for bounds checking.

* Move crash handling in safe string operations to separate TU

* strcat safe version

* sprintf made safe too

* Fix compile

src/m_Do/m_Do_main.cpp

@@ -145,7 +145,7 @@ s32 LOAD_COPYDATE(void*) {
         memcpy(buffer, readBuf, readLen);
         buffer[readLen] = '\0';
     } else {
-        strcpy(buffer, "PC PORT BUILD");
+        SAFE_STRCPY(buffer, "PC PORT BUILD");
         DuskLog.warn("COPYDATE file not found at {}", COPYDATE_PATH);
     }