* give new cord the same color as selected line (except for vanilla/ext presets)
* make broken object stand out more
* make comment dash sizes match l2ork 1.0
* change xlet hover animation to match new xlet style

This reworks the file button in the help browser so that it opens the file
browser on whatever directory we visited last (as given by the current_dir
variable), or the doc directory by default.

This reverts commit ac536d2f.

Fonts may not yet line up properly, especially in room_sim_3d where fontsize
is used to show z position. Also, no effort was made to improve the interface
of these classes. For example, size changes don't bump the source values
back within the bounds of the object.

canvas_events

Add labels to the device dropdowns in the MIDI setup so that the order in which devices are listed is obvious.

Help browser: Cosmetic changes in the GUI prefs, add a warning about the impact of help browser settings on startup times.

Help browser: Move the index construction into pdgui.js, so that it is only done once during startup.

Help browser: Construct the help index from all of lib/pd-l2ork, to make the keyword search more useful.