apps/graphics/pdcurs34: This commit brings the basic public domain pdcurses...

apps/graphics/pdcurs34:  This commit brings the basic public domain pdcurses library into NuttX.  This library is complete but not yet usuable because it still requires the NuttX interfacing code needed hook pdcurses into the NuttX graphics drivers.  Also test cases are needed to verify the pdcurses integration.