Add MangaKakalot and Manganato support

[Jan0660]

Adds support for:

• MangaKakalot
• Manganato

Both are implemented under the same struct since they have pretty much the same document structure except for CSS class names.

[coveralls]

Pull Request Test Coverage Report for Build 96

• 107 of 126 (84.92%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.7%) to 61.474%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/core/core.go	4	6	66.67%
pkg/sites/loader.go	0	4	0.0%
pkg/sites/common.go	75	88	85.23%
<!--	Total:	107	126	84.92%	-->

Totals
Change from base Build 94:	2.7%
Covered Lines:	734
Relevant Lines:	1194

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💛 - Coveralls

[Jan0660]

Thank you for the PR @Jan0660!

The PR overall is good, just one thing, despite the sites shares the same structure I would separate them in different files 😄

Fair enough, but where should I put the shared scraping code for the sites? Don't see an existing place in the folder structure for it. Or should I not share the code between them?

[Girbons]

Fair enough, but where should I put the shared scraping code for the sites? Don't see an existing place in the folder structure for it. Or should I not share the code between them?

Yep sharing code is fine, I was thinking about something like common.go. What are your thoughts on that?

[Jan0660]

Fair enough, but where should I put the shared scraping code for the sites? Don't see an existing place in the folder structure for it. Or should I not share the code between them?

Yep sharing code is fine, I was thinking about something like common.go. What are your thoughts on that?

Done! Also added some more tests for both of the sites.