the name `right/left_resource` is misleading

[zigen]

these names are misleading. it specifies the index. this should be right/left_resource_index https://github.com/sfc-aqua/quisp/blob/master/quisp/rules/actions/SwappingAction.h#L16 https://github.com/sfc-aqua/quisp/blob/master/quisp/rules/actions/SwappingAction.cc#L40