added file, dlib-posix.c, for loading extensions on posix systems
added file, dlib.h, to act as a wrapper for non-standard dynamic linkers
in file, .gitignore: added files generated by scons and some other test files to the list
Added conditional statements to build, and a build object for posix dynamic linker
in file, tui-termios.c: added early implementation for basic functions
in file, extension-text.c: added some implementation in tui_puts