Ensure properties are always set in props+targets

This prevents a scenario where the .NET SDK props don't get a key property early enough (i.e. TargetFramework) from the script and uses the one in the .csproj which was intended to be overriden.

+Mᐁ includes

Ensure when running from VS, output supports UTF-8

The console started by VS (even if it's the terminal one) by default does not seem to be set up to support UTF-8. To be on the conservative side, we just set up the encoding in DEBUG builds so things Just Work from VS by default.

This problem doesn't exist when running from a regular terminal.

Update SmallSharp SDK version in README

⬆️ Bump files with dotnet-file sync

Add blank sample with only implicit usings

Align #:property Name=Value with RC syntax

The final version is with an = sign. See https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/preprocessor-directives

Add IDE to readme/description

+Mᐁ includes

Add note on #:sdk being supported too