Fix init sequence without KompleteKontrol

This should address #22. Investigation and fix courtesy of @Xample.

S49 MK1 and S88 MK2 fix

• Fix S88 MK2, courtesy of @AlopexXx
• Fix S49 MK1, courtesy of @BrockAtkinson

S49, S25 and MAC

• Add support for Komplete Kontrol S49 MK1 and MK2 and S25 MK1
• Clarify instructions for Mac (thanks to audionerd and done84)
• Python 3.8

Initial support for KK MK1 and S88 MK2

• Add support for Komplete Kontrol MK1 (S61 and S88)
• Add support for Komplete Kontrol MK2 S88
• Happy dance when connected to Komplete Kontrol
• Misc refactoring

v1.0

Initial release