string: Convert string module to package and import templatelib.

Convert the existing `string` module into a package with `__init__.py`
and `templatelib.py`.  This is needed to support t-strings (if they are
enabled) because there is a built-in `string.templatelib` module with
built-in `Template` and `Interpolation` classes.

Signed-off-by: Damien George <damien@micropython.org>

aioble/examples: Change variable name to _ADV_INTERVAL_US.

Following 28136d8

Signed-off-by: Damien George <damien@micropython.org>

aiorepl: Handle stream shutdown.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>

aiorepl: Handle stream shutdown.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>

inspect: Implement iscoroutinefunction and iscoroutine.

Signed-off-by: Damien George <damien@micropython.org>

aioble: Pass additional connection arguments to gap_connect.

This allows the following arguments to be passed to `device.connect()`:

* scan_duration_ms
* min_conn_interval_us
* max_conn_interval_us

These are passed as-is to `gap_connect()`.  The default value for all of
these is `None`, which causes gap_connect to use its own defaults.

Signed-off-by: Joris van der Wel <joris@jorisvanderwel.com>

aioble: Pass additional connection arguments to gap_connect.

This allows the following arguments to be passed to `device.connect()`:

* scan_duration_ms
* min_conn_interval_us
* max_conn_interval_us

These are passed as-is to `gap_connect()`.  The default value for all of
these is `None`, which causes gap_connect to use its own defaults.

Signed-off-by: Joris van der Wel <joris@jorisvanderwel.com>

pyusb: Add MicroPython implementation of PyUSB library.

Signed-off-by: Damien George <damien@micropython.org>

aiohttp: Add new aiohttp package.

Implement `aiohttp` with `ClientSession`, websockets and `SSLContext`
support.

Only client is implemented and API is mostly compatible with CPython
`aiohttp`.

Signed-off-by: Carlos Gil <carlosgilglez@gmail.com>

aiohttp: Add new aiohttp package.

Implement `aiohttp` with `ClientSession`, websockets and `SSLContext`
support.

Only client is implemented and API is mostly compatible with CPython
`aiohttp`.

Signed-off-by: Carlos Gil <carlosgilglez@gmail.com>