develop/ktcc: Post-SVN tidy

- Move source code from `trunk` into program root directory.
- Update build files and include paths.
- These changes also update the CI build files in `.gitea/workflows/`.
- Note: Line endings standardised from `CRLF` > `LF`, so best to view diffs with whitespace changes hidden.

programs/develop/ktcc/lib/libshell/shell_printf.c

@@ -0,0 +1,12 @@
+#include <shell_api.h>
+#include <stdio.h>
+
+void shell_printf(const char *format,...)
+{
+    va_list ap;
+    va_start (ap, format);
+    *__shell_shm=SHELL_PUTS;
+    vsnprintf(__shell_shm+1, SHELL_SHM_MAX, format, ap);
+    va_end(ap);
+    __SHELL_WAIT();
+}