Parameters for IntegrationRuleCreator shouldn't be hardcoded

[henrij22]

As of now the parameter used for creating the subgrids which determine the precisness of geometry approximation are hardcoded in subgrid.hh as follows:

/// Parameters
static constexpr int maxOuterBoundaryDivisions{10};
static constexpr int maxInnerBoundaryDivisions{10};

static constexpr double outerTargetTolerance{1e-4};
static constexpr double innerTargetTolerance{1e-4};

This could be done for example with set default values and the possibility of an input file which overrides these default values. Maybe add a settings struct that can be passed into the trimmer / subgrid.

It would also be good if at least some of these settings could be changed during run-time and not compile-time.

[henrij22]

See also #16 -> define interface