class-parse fails when windows culture is French

[softlion]

While generating the binding for ExoPlayer, i stumbled upon this annoying bug.
A workaround is to change in Windows the default digit separator from "," (europe) to "." (usa)

Wrong generated code:

	[Register ("DIMEN_UNSET")]
	public const float DimenUnset = (float) 1,401298E-45;

Should be instead:

	[Register ("DIMEN_UNSET")]
	public const float DimenUnset = (float) 1.401298E-45;

This means the float value is formatted using the default culture instead of the invariant culture.

[softlion]

another sample

	[Register ("DEFAULT_BANDWIDTH_FRACTION")]
	public const float DefaultBandwidthFraction = (float) 0,75;