This commit shards the broad `core` feature of the libcore library into finer
grained features. This split groups together similar APIs and enables tracking
each API separately, giving a better sense of where each feature is within the
stabilization process.
A few minor APIs were deprecated along the way:
* Iterator::reverse_in_place
* marker::NoCopy
- Added missing reverse versions of methods
- Added [r]matches()
- Generated the string pattern iterators with a macro
- Added where bounds to the methods returning reverse iterators
for better error messages.
This commit cleans out a large amount of deprecated APIs from the standard
library and some of the facade crates as well, updating all users in the
compiler and in tests as it goes along.
possible blanket impls and also triggers internal overflow. Add some
special cases for common uses (&&str, &String) for now; bounds-targeting
deref coercions are probably the right longer term answer.
