UI: Load svgs from files instead of from data tags #4955

Job	Run time
Format check	11s
Lint check	1m 2s
Lint javascript	14s
Lint OpenAPI	15s
Spec	1m 53s
Compile LavinMQ	1m 23s
Spec OS X	2m 23s
Spec FreeBSD	2m 35s
Filters for frontend specs	3s
RabbitMQ HTTP API Go client test	58s
Test in release mode	19s
RabbitMQ java client test	5m 7s
Bunny client test	2m 37s
RabbitMQ HTTP API Ruby client test	48s
Frontend specs	0s
	19m 48s

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