fix(background): handle refresh better
fix(inspectedApp): handle refresh better
style(scopeTree): fix deep indentation
fix(panel): handle refresh better
fix(background): hydrate inspected app data on devtools connect
fix(background): remove data for closed tabs
feat(pageAction): show page action when instrumentation is active

Closes #199
style(inspectedApp): remove todo comment
style(json-tree.spec): add missing semicolon