Allow custom asset types in the build system #911

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	5m 24s
build (ubuntu, stable, native_assets_cli, false)	2m 7s
build (ubuntu, stable, native_toolchain_c, false)	1m 53s
build (ubuntu, dev, native_assets_builder, false)	5m 6s
build (ubuntu, dev, native_assets_cli, false)	2m 7s
build (ubuntu, dev, native_toolchain_c, false)	1m 53s
build (macos, stable, native_assets_builder, false)	5m 46s
build (macos, stable, native_assets_cli, false)	2m 35s
build (macos, stable, native_toolchain_c, false)	2m 29s
build (macos, dev, native_assets_builder, false)	5m 53s
build (macos, dev, native_assets_cli, false)	3m 14s
build (macos, dev, native_toolchain_c, false)	2m 54s
build (windows, stable, native_assets_builder, false)	7m 10s
build (windows, stable, native_assets_cli, false)	2m 20s
build (windows, stable, native_toolchain_c, false)	4m 3s
build (windows, dev, native_assets_builder, false)	7m 22s
build (windows, dev, native_assets_cli, false)	2m 58s
build (windows, dev, native_toolchain_c, false)	3m 20s
coverage-finished	2s
	1h 8m 36s

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