refactor: Rename ivhTreeviewSettings to ivhTreeviewMrg
test: Add placeholders for ivhTreeviewMrg test
feature: Add service for breadth first search
feature: Add select, deselect, validate abilities
fix: Whoops moved options provider to src

[ci skip]
test: Add tests for ivhTreeviewOptions
fix: Select nodes by id
feature: Add (de)selectAll and (de)selectEach
partial: Mid revamp... just changing locations
refactor: Working selection management and layout

Still needs expland/collapse
refactor: Add back expand/collapse functionality
chore: Add reminder for ivh-treeview-twistie
refactor: Reword expand/collapse func and style
docs: Add notes for new options
docs: Add usage info for ivhTreeviewMgr and ivhTreeviewBrfs
docs: Update changelog
chore: Bump for release (v0.3.0)
Merge branch 'ref.manager'