Change "variable argument(s)" to just "argument(s)"

They are not necessarily "variable" (could be a stack mess), plus
the line becomes shorter so there's more change it will fit into
the console screen.
Add newline at the end of file

Some compilers (e.g. GCC) may complain about the missing newline.
Include actual arguments in output even if no debug info available
Add "kCellWidthChars" constant replacing hard-coded width values
Fix values of Floats and bools

The tag string does not end with ":" any more, hence the bug.