Allow custom asset types in the build system (#1623) #913

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	5m 3s
build (ubuntu, stable, native_assets_cli, false)	1m 49s
build (ubuntu, stable, native_toolchain_c, false)	1m 58s
build (ubuntu, dev, native_assets_builder, false)	4m 56s
build (ubuntu, dev, native_assets_cli, false)	2m 7s
build (ubuntu, dev, native_toolchain_c, false)	2m 7s
build (macos, stable, native_assets_builder, false)	4m 25s
build (macos, stable, native_assets_cli, false)	1m 49s
build (macos, stable, native_toolchain_c, false)	2m 20s
build (macos, dev, native_assets_builder, false)	3m 53s
build (macos, dev, native_assets_cli, false)	2m 15s
build (macos, dev, native_toolchain_c, false)	1m 48s
build (windows, stable, native_assets_builder, false)	7m 27s
build (windows, stable, native_assets_cli, false)	2m 6s
build (windows, stable, native_toolchain_c, false)	3m 53s
build (windows, dev, native_assets_builder, false)	7m 37s
build (windows, dev, native_assets_cli, false)	2m 46s
build (windows, dev, native_toolchain_c, false)	3m 46s
coverage-finished	2s
	1h 2m 7s

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