make MutableVec and MutableBTreeMap lock-free and more ECS-native, removing the need to flush, plus some misc. (#10)

Author: databasedav

CHANGELOG.md

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+all notable changes to this project will be documented in this file
+
+the format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and [Common Changelog](https://common-changelog.org/), and this project vaguely adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
+
+## unreleased
+
+### changed
+
+- reactive collections `MutableVec` and `MutableBTreeMap` are now lock-free and managed by entities and components
+- `Signal*Clone` renamed to `Signal*DynClone`
+
+### added
+
+- `SignalProcessing` `SystemSet` for scheduling systems around signal processing
+- `MutableVec` and `MutableBTreeMap` can be built from with `FromWorld`, `&mut World`, and `&mut Commands`
+- `MutableVecBuilder` and `MutableBTreeMapBuilder`
+- `JonmoBuilder::on_spawn_with_system` convenience method
+- `JonmoBuilder::observe` convenience method
+- `JonmoBuilder::on_signal_with_entity` convenience method
+- deref convenience for `LazyEntity`
+