port all relevant externals to the new loadbang interface. Unfortunately it has some #defines hidden in g_canvas.h, so we port that macro individually to each affected library.

improvements to the dropdown atom: use scrollbar when menu size exceeds the viewport size. Also, add keybindings for Enter, Escape, Space, arrow keys, and navigating options by matching keypresses to the first character

sys_expandpathelems: replacement for @pd_help should be the last element on the path, not the first.

Simplify the pipeline in sys_initloadpreferences() so that we read the preferences directly using plutil now.

This is done by importing the config data using 'defaults import' in
one go, which is *much* faster than the previous implementation which
invoked the shell to run 'defaults write' for each individual key.

Intelligent patching mode 4 often just always prefers option A (outgoing
connections). But if the user actually wants option B (incoming connections),
he can't get it because option A was chosen. This is confusing, which is why
mode 4, while very useful if it works as intended, can be rather difficult to
use right now.

We therefore now take into account the status of the ctrl modifier, which
simply reverses our choice of option A or B, so that the user now has a way of
getting option B even if option A is preferred (and vice versa). If the ctrl
modifier isn't pressed, mode 4 works exactly as before, so this change is
fully backwards-compatible.

fix dropdown menu on Windows-- it uses nw.js 0.14.7 which didn't include the "forEach" method for DOM nodelists

Backported vanilla commit 67b3095a by Ant1r: Fix the way signal scalars are searched into the list of inlets of an object.

Backported the changes in m_obj.c from vanilla commit 7e29725 by millerpuckette; these fix the problem with secondary signal inlets not working without a main signalin.

Backport rev. 5a58ca2b by msp from vanilla: patch 1990599 - allow recursive calls of new_anything().

Bump vanilla compatibility version due to an API change in the loader extension interface (rev. b66acec3 in vanilla).