Rate limits caps for fertility, mortality, and prevalence rates

[celiot-IDM]

This is a partial BREAKING CHANGE.

1. The code assumes there is a "ChangeRateLimits" sheet with appropriate format. (As with all sheets, the default name can be overridden.)
2. The rate limits defined in the ChangeRateLimits sheet will limit future rate predictions, which will affect time-on-task etc calculations. This is a "partial" breaking change because if the rate limits are set far enough out, there should be no changes.

Addresses issue #119 (refer for more details)

[celiot-IDM]

@MeWu-IDM : lots of snapshots have changed. Over to you!

[celiot-IDM]

@MeWu-IDM : Just checking that you saw that the NA change limits problem should be addressed now.

[MeWu-IDM]

there is no checks for max being negative values so this may generate weird results when setting negative max

[MeWu-IDM]

We also need to check if limits$max> limit$min, otherwise the logic does not make sense

[MeWu-IDM]

I think we need to update the vignetter/pacehhrh.rmd to have section to explain the ChangeRateLimit spreadsheet based ion #119 logic as they are not very straightforward

[rhanIDM]

Moving this to issue #246.

[github-actions]

Package	Line Rate	Complexity	Health
pacehrh	94%	0	✔
Summary	94% (2510 / 2660)	0	✔

Minimum allowed line rate is 60%

[celiot-IDM]

@MeWu-IDM : Rate limit validation code has been checked in, and all checks have passed. Over to you!

[rhanIDM]

The change rate limits work as expected. The documentation for implementation details and expected behavior will be addressed by issue #246.

[celiot-IDM]

Thank you @MeWu-IDM and @rhanIDM !