Allow custom asset types in the build system #909

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	5m 1s
build (ubuntu, stable, native_assets_cli, false)	2m 0s
build (ubuntu, stable, native_toolchain_c, false)	2m 1s
build (ubuntu, dev, native_assets_builder, false)	5m 9s
build (ubuntu, dev, native_assets_cli, false)	2m 9s
build (ubuntu, dev, native_toolchain_c, false)	2m 1s
build (macos, stable, native_assets_builder, false)	6m 49s
build (macos, stable, native_assets_cli, false)	2m 28s
build (macos, stable, native_toolchain_c, false)	4m 10s
build (macos, dev, native_assets_builder, false)	5m 8s
build (macos, dev, native_assets_cli, false)	2m 13s
build (macos, dev, native_toolchain_c, false)	4m 20s
build (windows, stable, native_assets_builder, false)	7m 52s
build (windows, stable, native_assets_cli, false)	3m 7s
build (windows, stable, native_toolchain_c, false)	5m 15s
build (windows, dev, native_assets_builder, false)	7m 36s
build (windows, dev, native_assets_cli, false)	2m 55s
build (windows, dev, native_toolchain_c, false)	3m 39s
coverage-finished	4s
	1h 13m 57s

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