Keymap: Redox / jeherve: updates (#4694)
* Start using send_unicode_hex_string for shrug
See https://docs.qmk.fm/#/feature_unicode?id=send_unicode_hex_string
* Make sure one can come back to main layer after tapping to NAV
* Add 4 new keys to symbol layer
~, `, =, +, are now more accesssible. No need to reach out far from home row anymore
* Add two new macro keys
I did not have much use for the Expose key and the right Command key, so opted to replace those with 2 Macros:
- One to invoke Alfred: https://www.alfredapp.com/ => Opt + Space
- One to invoke 1password: https://1password.com/ => Cmd + Opt + \
* Update readme to mention changes in new version
* Remove unneeded short definition
* Shorter name for our custom key
See https://github.com/qmk/qmk_firmware/pull/4694#discussion_r243341864
* Make macros one-liners
See https://github.com/qmk/qmk_firmware/pull/4694#discussion_r243341487
* Switch to using eeconfig_init_user to set Unicode mode
See https://github.com/qmk/qmk_firmware/pull/4694#issuecomment-449151724
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