S4-clarity

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- (33) Fixed regression in 1.3.0 which caused all stage-based routing to fail

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- (25) Added support for the [Clarity Instruments API endpoint](https://d10e8rzir0haj8.cloudfront.net/5.3/rest.version.instruments.html):
- Added a new `Instrument` class
- Updated `StepConfiguration` (in `configuration.protcol`) and `StepDetails` (in `step`) to retrieve `instrument` related xml subnodes
- (24) Add a `files` property to the `Project` class
- (30) Fixed `workflow.enqueue()` setting `stage-uri` in generated XML if `stage` appears in the domain name
- (28) Removed dependency on `typing` for Python versions 3.5 and up
- Updated documentation:
- (27) The `StepProgramStatus` class documentation now more accurately reflects usage
- (29) The documentation of the `Stage` class has corrected to show that the `step` property returns a `StepConfiguration` object

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- Fix `ClarityElement.__repr__` to always return a string to avoid exceptions in Python 3.x
- Fix incorrect universal tag for ControlType that prevented the creation of Control Types using the library
- Add is_published property to the File object

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- Remove timeout from wait_for_epp

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- Add suport for Clarity 5 demux endpoint
- Add support for timeouts on Clarity HTTP requests

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- s4.scripting -> s4.clarity.scripts
- s4.steputils -> s4.clarity.steputils
- s4.utils -> s4.clarity.utils

- Removed s4.bartender
- Removed s4.packager
- Removed s4.clarity.monitor