Remove unsupported HKFE from MHDB (QuantConnect#6990)

* Remove HKFE from MHDB

- Remove unsupported HKFE from MHDB

* Update tests

Remove unsupported HKFE from MHDB (QuantConnect#6990)

* Remove HKFE from MHDB

- Remove unsupported HKFE from MHDB

* Update tests

Fixes Insight Period Calculation (QuantConnect#6978)

The calculations of `CloseTimeUtc` are correct and consistent: if the exchange is closed when the insight expires, `CloseTimeUtc` is the next open.

However, the definition of the `Period` was not consistent. Normally, it is defined by the different between `CloseTimeUtc` and `GeneratedTimeUtc`, but when we create an Insight with the Resolution and bar count overload, the period was defined by them:

```csharp
insight.Period = Resolution.ToTimeSpan().Multiply(BarCount);
```

which is incorrect, since it doesn't take the days the exchange is closed into account. The `ComputePeriod` method enforced consistency between the Resolution and bar Count overload and the `DateTime` overload, so the period for this overload was also incorrect.

Adjust index option data timezone (QuantConnect#6970)

* Fix index option data timezone

- Fix index option data timezone which was 1 hour late than expected

* Update existing index option tests

- Update existing index option tests.
- Disable index option daily resolution support

Update readme.md

Update readme.md

Fix future daily price scale factor update (QuantConnect#6963)

* Fix future daily price scale factor update

- Fix future daily price scale factor update which was happening 1 day
  late due to data and exchange time zone differences.
  Adding regression algorithm reproducing and asserting it.

* Address review

Unsettled cash conversion rate update (QuantConnect#6961)

* Update unsettled cashbook cash conversion rates

Also moved conversion rate holding from Cash to the CurrencyConversion
instance

* Minor fixes

* Peer review

* Minor fixes

* Minor fixes

* Minor fixes

Add support for HTML reports conversion to PDF (QuantConnect#6960)

* add wkhtmltopdf to lean image

* convert html to pdf

* avoid black stripts at bottom of each page

* address reviews

* address review

* address reviews

* self review

* address review

Fix security cache reset (QuantConnect#6959)

* Fix security cache reset

- Fix security cache reset so it only happens when no universe has it as
  a member. Adding regression algorithm reproducing issue

* Avoid non deterministic FillForward behavior