Feat/resizable

[giovannic]

Some simulations require dynamic population sizes, this is a start at implementing that support. Hopefully the first of three pull requests for resizeable variables (Double, Integer and Categorical). This one is just for ResizeableDoubleVariable.

ResizeableDoubleVariable allows clients to queue "extentions" and "shrinks", which will be applied after normal updates.

Extentions will add new individuals with an initial value. e.g.

age$queue_extend(rep(0, n_births))

It can be used to model births or importation in a population.

Shrinks can selectively remove individuals from a variable, using either a bitset or a variable. e.g.

age$queue_shrink(deaths)

It can be used to model death-like processes in a population.

Notable Changes:

• Consolidated filtering algorithm (from bitset_filter) into FilterIterator, so that it can be used with any iterables
• New C++ classes, C++ interface and R6 objects for ResizeableDoubleVariable
• Inheritance-based resizing updates

[codecov[bot]]

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