tcledit/libwld:  Should not depend on configured trv_pixel_t or dev_pixel_t.  Assume always uint8_t and uint32_t TrueColor.

Modbus Master is missing many files and doesn't compile at all. I'm attaching diff with my implementation. More details in https://groups.yahoo.com/neo/groups/nuttx/conversations/topics/13734

apps/nshlib: nsh_getdirpath(), use snprint instead of sprintf to avoid possibility of buffer overrun.  Noted by Chung Hwan Kim.

Add a new buttons example that uses the button character driver instead of the architecture buttons directly