Allow custom asset types in the build system #910

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	5m 28s
build (ubuntu, stable, native_assets_cli, false)	1m 53s
build (ubuntu, stable, native_toolchain_c, false)	1m 59s
build (ubuntu, dev, native_assets_builder, false)	5m 1s
build (ubuntu, dev, native_assets_cli, false)	2m 10s
build (ubuntu, dev, native_toolchain_c, false)	2m 8s
build (macos, stable, native_assets_builder, false)	4m 55s
build (macos, stable, native_assets_cli, false)	2m 1s
build (macos, stable, native_toolchain_c, false)	2m 40s
build (macos, dev, native_assets_builder, false)	7m 45s
build (macos, dev, native_assets_cli, false)	2m 44s
build (macos, dev, native_toolchain_c, false)	2m 40s
build (windows, stable, native_assets_builder, false)	7m 17s
build (windows, stable, native_assets_cli, false)	2m 47s
build (windows, stable, native_toolchain_c, false)	3m 51s
build (windows, dev, native_assets_builder, false)	7m 3s
build (windows, dev, native_assets_cli, false)	2m 41s
build (windows, dev, native_toolchain_c, false)	4m 20s
coverage-finished	4s
	1h 9m 27s

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