docs(guide/expressions): replace curly quotes with straight quotes in code example

REAL QUOTES HAVE CURVES

Closes #10017
docs($route): fix description of the caseInsensitiveMatch property

Closes #10028
docs(guide/expressions): clarify regexp literals usage in expressions

Closes #10026

Closes #10030
refactor($parse): separate tokenizing vs parsing more
Fixes `a.b` and `a .b` generating different getterFns
Fixes `{'': ...}` turning into `{"''": ...}`
Fixes `{.: ...}` parsing as `{'.': ...}` instead of throwing
Fixes #9131
fix(filterFilter): correctly handle deep expression objects

Previously, trying to use a deep expression object (i.e. an object whose
properties can be objects themselves) did not work correctly.
This commit refactors `filterFilter`, making it simpler and adding support
for filtering collections of arbitrarily deep objects.

Closes #9698
test(filter): test expression object with inherited properties

Related to #9984