layers: Remove non-template GetFoo() state tracker methods #3546
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Remove these extra wrapper methods so that it easier to find
(and change) places where state lookups occur. The one place where
wrappers are necessary is where a state object is subclassed. These
can probably be templated, once sufficient template magic is acquired.
NOTE: This change converts all result variable to 'auto' not 'auto *'
because most of these will soon become smart pointers causing the
latter to no longer work.