General cleanup:

General cleanup:
- eliminate types.h from plugins
- newheaders: texpara.h usershape.h
- rename textline_t to textpara_t in preparation for the use of pango paragraph formatting.
- rename various related "*line*" variables to "*para*"
- remove some unused builtin.c files
- fix builtins so that dot_static always works
- change !DISABLE_CODEGENS to WITH_CODEGENS
-support configure options:
	--without-codegens
	--without-pangocairo
	--without-libgd
(all enabled by default if requirements met)