Simple lower-case name of the platform

Property definitions

	# Simple lower-case name of the platform
	fun name: nullable String do return null

src/platform/platform.nit:110,2--111,41

	redef fun name do return "android"

src/platform/android.nit:37,2--35

	redef fun name do return "emscripten"

src/platform/emscripten.nit:34,2--38