Remove predicate functions - use filter_deployments()

[damianooldoni]

Once #315 is completed, we can replace the predicates with filter functions. Here below the most important steps:

• Remove predicate related functions UPDATE make predicate functions defunct
• UPDATE: Add item in NEWS.md
• Replace the use of predicate function with filter_deployments()
• Update function documentation
• Update vignette Vignette: filtering operations, reading camtrapdp objects, manipulating camtrapdp objects #320
• Remove tests

[PietrH]

Functions should not do any filtering at all internally, any filtering should happen before and be piped in.

So lines using predicates can just be removed.

[PietrH]

We should make a new vignette about the filtering functions : how to read data, how to manipulate camtrapdp objects

[PietrH]

There are still references to mica in my branch:

camtraptor/R/get_n_species.R

Line 14 in a10adc1

#' get_n_species(mica)

Probably should remove these, I don't want to do this in the same branch

[PietrH]

I should also scan the package of the word filter in the documentation and examples, as well as keep an eye out for triple dots: ...

[damianooldoni]

Based on good practices, we must make these functions defunct, instead of just removing them.

[damianooldoni]

Fixed by PR #331. The task of updating the vignette has been already transferred to a separate issue.