MEDYAN.FilamentEndSiteMask
Union{}
Filament end site that matches monomer states using per-position bitmasks.
This is the end-site analog of FilamentSiteMask: each position in the pattern has a StateBitMask specifying which MonomerState values are acceptable.
The pattern order is always from minus end toward plus end, regardless of which tip (isminusend) is being matched.
If both_ends is true, the pattern must match the entire filament: the filament must have exactly length(masks) monomers, so both ends are anchored.
isminusend::Boolmasks::Vector{NTuple{4, UInt64}}spacing::Float64added_monomers::Int64both_ends::Bool