fix: Clear mappings when switching profiles

fix: Support the extended-key flag

docs: Update the GUI image

feat: Add scan codes support

refactor: Domain-driven design

fix: CAPSLOCK and other toggle keys support

fix: Map the = key to EQUALS

docs: Update changelog and readme for 0.15.0

feat: Auto-reload settings or profile settings

fix: v0.14.1 updates

docs: Update README for 0.14.0

feat: 0.14.0 updates

Break a long line in two.

Update the README.

Add Profiles to ToC in the README.