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Move Settings subpages currently residing in the main module
to the lazy module. This change further reduces the amount of code
(both JS and HTML) that is part of the main module.

Previously it was assumed that only elements in the "Advanced" section
resided under the lazy_load.html module. With this change, subpages
that are part of the basic module are also moved to lazy_load.html.

The change in main_page_behavior.js is necessary to ensure that subpages
are force loaded before we attempt to display them.

Numbers from Linux build (before -> after):
vulcanized.html           298K -> 239K, -59K, -19.8%
crisper.js                346K -> 285K, -61K, -17.6%
lazy_load.vulcanized.html 149K -> 207K, +58K, +38.9%
lazy_load.crisper.js      179K -> 240K, +61K, +34.1%

In this CL intentionally not touching any ChromeOS specific subpages
(will address in follow up CL).

Bug: 1026064
Change-Id: I3b1ef541ce9d6e3a267e0b2434154c632b0b1a3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1922295
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719484}