Bug Fix: Ensure system downtime starts appropriately

[RHammond2]

This PR addresses a series of logic holes:

• Servicing equipment can no longer travel when their expected finish time is in the following shift, but after the original shift's end time
• Repairs with delays that are incomplete at the end of the original forecast window now consistently register as having a shift delay instead of being complete
• Systems wait until a servicing equipment has arrived and is going to transfer the crew to interrupt it and shut it down, rather than at the onset of traveling to the system.

See the changelog for complete details. All changes result in a small net positive increase in availability due to better resolved timing of shut downs and repairs.

[codecov[bot]]

Codecov Report

Patch coverage: 49.57% and project coverage change: +0.32% :tada:

Comparison is base (c2f530a) 54.69% compared to head (403eef1) 55.02%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #111 +/- ## =========================================== + Coverage 54.69% 55.02% +0.32% =========================================== Files 21 21 Lines 3607 3669 +62 Branches 730 745 +15 =========================================== + Hits 1973 2019 +46 - Misses 1512 1528 +16 Partials 122 122 ``` | [Files Changed](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM) | Coverage Δ | | |---|---|---| | [wombat/core/port.py](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM#diff-d29tYmF0L2NvcmUvcG9ydC5weQ==) | `14.75% <0.00%> (-0.33%)` | :arrow_down: | | [wombat/core/repair\_management.py](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM#diff-d29tYmF0L2NvcmUvcmVwYWlyX21hbmFnZW1lbnQucHk=) | `63.01% <30.23%> (-5.79%)` | :arrow_down: | | [wombat/core/service\_equipment.py](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM#diff-d29tYmF0L2NvcmUvc2VydmljZV9lcXVpcG1lbnQucHk=) | `65.25% <80.85%> (+3.23%)` | :arrow_up: | | [wombat/core/environment.py](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM#diff-d29tYmF0L2NvcmUvZW52aXJvbm1lbnQucHk=) | `77.15% <100.00%> (+0.25%)` | :arrow_up: | | [wombat/windfarm/system/cable.py](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM#diff-d29tYmF0L3dpbmRmYXJtL3N5c3RlbS9jYWJsZS5weQ==) | `76.22% <100.00%> (+0.33%)` | :arrow_up: | | [wombat/windfarm/system/system.py](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM#diff-d29tYmF0L3dpbmRmYXJtL3N5c3RlbS9zeXN0ZW0ucHk=) | `92.00% <100.00%> (+0.21%)` | :arrow_up: |

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