Fix Gitlab reports: use upstream master

See merge request redox-os/ion!937

Add benchmark and binary size tests to CI

See merge request redox-os/ion!933

Update README.md

See merge request redox-os/ion!936

Trim start and end of commands

See merge request redox-os/ion!930

Fix ctrl-c with interactive session

See merge request redox-os/ion!932

Require cargo fmt

See merge request redox-os/ion!929

Update to new toolchain

See merge request redox-os/ion!928

Fix the benchmark

See merge request !926

Move the test to its own file
Copy 3 times the same program to better evaluate efficiency
Don't use `println`: buffering skews the benchmark

Terminator iterator

See merge request redox-os/ion!922

SmallVec is not included because benchmarks showed 20% regression.
Terminator can't be reset because that also made the code slower.

Move the body of the next() function to handle_char to be able to handle
a char after skipping withspace. When more than one whitespace character
is present, trim the remaining ones. If a line ends with && or ||,
continue parsing

Use native string functions for range parsing

See merge request redox-os/ion!925

The `next()` call caused the REPL to hang. Until I find a better way to
handle it, remove it.
Fix REPL insertion of newlines.

TODO: remove comments and make it a true iterator

Handle comments directly in the iterator.
Reorder quotes matching to make it more obvious.
Remove index matching.
Move the loop to an internal API which requests iterators.