readability check to suggest usage of sequence containers front()/back()

[Quuxplusone]

Bugzilla Link	PR38684
Status	NEW
Importance	P enhancement
Reported by	Eugene Zelenko (eugene.zelenko@gmail.com)
Reported on	2018-08-23 17:34:08 -0700
Last modified on	2018-11-30 14:07:21 -0800
Version	unspecified
Hardware	All All
CC	alexfh@google.com, djasper@google.com, klimek@google.com
Fixed by commit(s)
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It'll be great to have readability check which will suggest to replace next
patterns for containers:

*container.begin()

to

container.front()

*container.rbegin()

to

container.back()

Same for cbegin()/crbegin()

[Quuxplusone]

Other useful replacement for vector/array/deque is:

*( container.begin() + <integer constant> )

to

container.at( <integer constant> )

Same for cbegin().

[Quuxplusone]

See also bug 27905.