Fixed bug that didn't free ftpd ressources on end of session

Revert "apps/examples/ostest: Skip the task_restart() test on SMP systems.  This is not fully implemented."

This reverts commit 0ce49462.

Revert "apps/examples:  Remove the timer example.  It uses a non-portable IOCTL and must be purged."

This reverts commit dba181d0.

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