SCT: Better Sheet support for "Go To" menu [1]
Bug Number: n/a
Release notes (y/n): Yes
For Release Nums: 7.1 (6-26-2017, after initial pre-release).

See original analysis.  This is am implementation (with a few nuances) of
Proposal 2:
http://cadswes2.colorado.edu/~philw/2017/SCT/GoToMenu/SctGoToMenuWithSheetSupport-Analysis.html

As before -- though now in a somewhat different way -- the SCT's "Go To" menu
presents items for each Sheet divider and Slot divider.  Selecting an item
switches to the appropriate sheet and scrolls the SCT to either the beginning
of that sheet, or to the indicated Slot divider within a sheet.

Previously, if there are fewer than 22 such dividers, those Sheet and Slot
divider items were presented as top level items in the "Go To" menu.  If
there were more than 22 such dividers, integer-numbered submenus were
presented ("1", "2", "3") with approximately equal numbers of divider items,
up to 22 each.

With this change, IF the SCT contains Sheets, "Go To" submenus are presented
for each Sheet.  For Sheets that contain Slot Dividers, a submenu is presented
with an initial "Start of Sheet" item, and items for each contained Slot
Divider.  If the SCT doesn't contain sheets, then Slot Dividers are presented
as top-level items in the "Go To" menu.

  http://cadswes2.colorado.edu/~philw/2017/SCT/GoToMenu/2017-06-19/SctGoToMenus1.png
  http://cadswes2.colorado.edu/~philw/2017/SCT/GoToMenu/2017-06-19/SctGoToMenus2.png

Alternative behavior has been implemented which can be enabled through the
use of these compile-time symbols:

static const bool  NONSHEET_USE_JUMP_SUBMENUS (false);    // 7.1: false
static const bool  LIMIT_SHEET_JUMP_SUBMENU_SIZE (false); // 7.1: false
static const int   MAX_ITEMS_PER_JUMP_SUBMENU (22);       // 7.1: 22

If "NONSHEET_USE_JUMP_SUBMENUS" is changed to "true", then SCTs not containing
Sheets having more than 22 Slot Dividers present the originally developed
integer-numbered submenus.

If "LIMIT_SHEET_JUMP_SUBMENU_SIZE" is changed to true, then if a particular
sheet contains more than 22 Slot Dividers, multiple top-level submenus are
presented for the Sheet, with each submenu containing up to 22 divider items.
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