* b_sym field to t_textbuf
* 2nd inlet and "send" method for text define
* text insert class
* improve a stray evalfile error
* show the [text] name (if it exists) in the title for the window
* updates help doc accordingly

commit: 619f056b3f39e04e482d04854c1c166de2621d64

commit: 306dc0559ccfbeb2c0ab02843d572bb1f3bf85f6

This makes it possible to define an editable viewport outside of which the
contents are clipped.

One big benefit is that the getrect routine doesn't need to fetch the bboxes
of the shapes inside the viewport. It just needs the svg width, height, x,
y, and parent transform. It's also possible to add an optimized branch if
there is no parent transform specified.

One drawback is that the HTML5 method getBBox() includes the clipped content
in its calculation. That means the user will get scrollbars even though the
[draw svg] is clipping the contents which cause the scrollbars. Hopefully we
can just work around this by adding a "scrollbars" method for canvases to
just turn them off altogether.

Code for an experimental [draw array] is also added here. Combining it with
the viewport of [draw svg] will make it possible to interact with arrays of
widgets without the performance penalty normally associated with mouse
motion on Pd canvases.

Also:
* fixes some display bugs in certain cases for [draw image] and
[draw sprite]
* adds a default png for both [draw image] and [draw sprite] if none are
given

keep midr-mjpeg.mov in pd/doc/media, but remove all the copies of external media files. There aren't any references to those copied files in any of the docs, so they are useless. This means the root "doc" directory is now gone.

Convert the About Pd-l2ork text to DOS line endings, so that Windows' sad excuse for a default text editor displays it properly. Fixes #248.