feat: split prioritized CCs and discover first

[varet80]

This PR tries to help dependent CCs to be discovered first.

• Add Constant to allow easy addition of priority CCs
• add a small function to create split list
• iterate through the list

[coveralls]

Pull Request Test Coverage Report for Build 581463131

• 13 of 25 (52.0%) changed or added relevant lines in 1 file are covered.
• 10 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 19.388%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/Gateway.js	13	25	52.0%

Files with Coverage Reduction	New Missed Lines	%
lib/Gateway.js	10	20.3%

Totals
Change from base Build 581171326:	0.1%
Covered Lines:	2027
Relevant Lines:	10724

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💛 - Coveralls

[varet80]

This is part of multiple PRs to solve the RGBW

this first PR is to increase HASS flexibility and tries to partially solve : #595 #477 and #351

After that another pr will introduce an improved Color Switch

[robertsLando]

I suggest to move this const inside the function getPriorityCCFirst on gateway side for now, and instead of hard coding the 51 use the zwavejs COmmandClasses struct (like we do in the switch case in discover value

[robertsLando]

LGTM