This changeset is motivated by a simple concept - get rid of the MiniYaml.Clone and MiniYamlNode.Clone methods to avoid deep copying yaml trees during merging. MiniYaml becoming immutable allows the merge function to reuse existing yaml trees rather than cloning them, saving on memory and improving merge performance. On initial loading the YAML for all maps is processed, so this provides a small reduction in initial loading time.
The rest of the changeset is dealing with the change in the exposed API surface. Some With* helper methods are introduced to allow creating new YAML from existing YAML. Areas of code that generated small amounts of YAML are able to transition directly to the immutable model without too much ceremony. Some use cases are far less ergonomic even with these helper methods and so a MiniYamlBuilder is introduced to retain mutable creation functionality. This allows those areas to continue to use the old mutable structures. The main users are the update rules and linting capabilities.
Removes the 'activeMCVs' list since it was not useful.
The real bugfix is not iterating over 'activeMCVs' when issueing new orders
(this was previously needed for already discovered mcvs that stopped)
but over 'newMCVs' instead.
Fix MCV Manager glitch when restrict building area is enabled. It was checking if the location was close enough to the Base center instead of using the MCV Managers min and max ranges. This would cause it to often have no valid locations despite having a huge range.
