Update hxml define to haxe5preview1

[yuxiaomao]

Manually update based on https://github.com/HaxeFoundation/haxe/blob/development/src-json/define.json and

• Rename default to defaultValue
• Removed DisplayDetails (as only used by vshaxe and is deprecated in haxe5)
• Add more hl_ver
• Fix C# target not displayed correctly in the description

Note:

• If we're going to use Receive defines from haxe on server start #145 for all haxe >= 5, it can still provide fallback and invalid flags info (but it's less interesting because this need manual update)
• Not sure if signatureNeutral / deprecatedDefine etc need to be included
• The defines are unified to use - instead of _ in haxe's define.json, this has not impact on #if completion because vshaxe doesn't support it for the moment. However, if using display/defines request we still receive unified _.

[kLabz]

Not sure if signatureNeutral / deprecatedDefine etc need to be included

• signatureNeutral could be useful in some (niche) way as it's an indicator of whether a different cache should be used or not. I could at least see it being used by vshaxe itself in server view to display defines actually used to determine the signature, as I've had to do manually today for Fix duplicate context with haxe 5 #147

• deprecatedDefine could also be used later I guess?

[kLabz]

I think we can merge this? (regardless of #145 which I'll be testing)