Pyscript 1.1.0 release

The 1.1.0 release contains some cool new features and some bug fixes.

New features:

• New decorator @mqtt_trigger supports triggering off mqtt events, including an optional trigger expression, by @dlashua (#98, #105).
• All .py files below the pyscript/scripts directory are autoloaded, recursively, allowing you to arrange your scripts in sub-directories (or deeper) (#97).
• pyscript.reload only reloads changed files (changed contents, mtime, or an app's yaml configuration). All files in an app or module are reloaded if any one has changed, and any script, app or module that imports a changed modules (directly or indirectly) is also reloaded. Setting the optional global_ctx service parameter to * forces reloading all files (which is the behavior in 1.0.0 and earlier). See #106.
• Any script file name or directory name starting with # is skipped, which is an in-place way of disabling a specific script, app or directory tree; think of this as "commenting" the script or directory (#97).
• Added state_hold_false=None optional period in seconds to @state_trigger() and task.wait_until(). This requires the trigger expression to be False for at least that period (including 0) before a successful trigger. Setting this optional parameter makes state triggers edge triggered (ie, triggers only on transition from False to True), instead of the default level trigger (ie, only has to evaluate to True). Proposed by @tchef69 (#89), with suggestions from @dlashua (#95).
• @time_trigger now supports a "shutdown" trigger, which occurs on HASS shutdown or whenever the trigger function is no longer referenced (eg: during reload, or redefinition in Jupyter), proposed by @dlashua (#103).
• task.unique now allows multiple names to be "owned" by each task to support cases where you need to be exclusive against multiple other functions; provided by @dlashua.
• del and a new function state.delete() can delete state variables and state variable attributes.
• Updated versions in tests/requirements_test.txt.

Breaking changes:

• The pyscript.reload service only reloads changed files; prior behavior of reloading all files can be requested by setting the optional global_ctx service parameter to *.
• The trigger_time trigger function argument is now set to "startup" for a startup trigger, rather than None. This was done to be consistent with the new shutdown trigger, which calls the trigger function with trigger_time="shutdown". If you use trigger_time is None to detect a startup trigger, you'll need to change that to trigger_time == "startup" (see #103).

The bug fixes include:

• State setting now copies the attributes, to avoid a strange MappingProxyType recursion error inside HASS; reported by @github392 (#87).
• The deprecated function state.get_attr was missing an await, which causes an exception; it now works correctly, but please use state.getattr since the old function will be removed in a future release; reported and fixed by @dlashua (#88).
• The packaging module is installed if not found, since certain HASS configurations might not include it; fixed by @raman325 (#90, #91).

Thanks to @dlashua for adding @mqtt_trigger and multiple names in task.unique(), proposing several new features, as well as bug fixes and testing, and @raman325 for some bug fixes.

Enjoy!