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_putc.c

@@ -0,0 +1,9 @@
+#include <shell_api.h>
+
+void shell_putc(char c)
+{
+    __shell_init();
+    *__shell_shm = SHELL_PUTC;
+    *(__shell_shm+1) = c;
+    __SHELL_WAIT();
+}