Feature/add remove plugins

[coveralls]

Pull Request Test Coverage Report for Build 70

• 66 of 67 (98.51%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+16.3%) to 91.25%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/coffee/synyx/frontpage/PluginDto.java	2	3	66.67%
<!--	Total:	66	67	98.51%	-->

Totals
Change from base Build 44:	16.3%
Covered Lines:	73
Relevant Lines:	80

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💛 - Coveralls