Improve HTML encode to handle single quotes

[slang25]

This library is great! I found that it doesn't HTML escape single quotes, so here's a small PR...

[ltrzesniewski]

Thanks! I thought single quotes didn't really need to be escaped. Did you find a case where it's an issue?

[ltrzesniewski]

There are also other places in the code where HTML escaping is performed. Those would need to be updated as well.

[slang25]

So I coded this up late last night, hence the mistakes 😄
What led me to create this PR is that my test started failing after switching from RazorLight, it is expecting ' for '.
From some research, it should be encoded to either ' or ' (this is the hex representation), however I chose the hex implementation as it's what the other razor libraries do, and that's what the System.Text.Encodings.Web.HtmlEncoder.Default implementation does:

System.Text.Encodings.Web.HtmlEncoder.Default.Encode("foo's").ShouldBe("foo's");

So copying this would lead to less surprises for future adopters.

[ltrzesniewski]

Ok, thanks for the explanation. I'll review this in more detail tonight, but I can already say that:

• You didn't implement the #else case in HtmlHelper
• HtmlTemplate.Write needs the same changes

[slang25]

Thanks for catching those @ltrzesniewski, changes made

[ltrzesniewski]

That backtick looks wrong

[slang25]

I have no excuse this time 🤦‍♂️

[slang25]

I'm thinking this should also handle chars outside of the ASCII range, let me take a quick look at that too

[ltrzesniewski]

I don't think that's really required, everything handles Unicode now.

[ltrzesniewski]

I released this in v0.4.3 - thanks! 🙂

[slang25]

Amazing, thanks @ltrzesniewski