The fixes for hot fixes

Bug Fixes

• context information is not always properly emulated in hot-render, fixes #1094 (100fc9c)
• RHL could update non-relative components (5d4f226)
• update memo updater and comparator. fix #1135 (826a57c)
• allow multiple 'hot' in one file, registering only the first one (68c2a0a)
• error overlay initialization prior body, fixes #1127 (9177aba)