Canvas other UTF-8/16/32 character support

[Kolky]

I've wrote another version of the Canvas that supports other rendering characters than the default space (" "). It supports providing UTF-8, 16 and 32 characters. When another character is seen than the default space, it will use the foreground color instead of the background color. This allows you to use the Canvas with blocks or other special characters.

Few things before I make a PR:

• Should I integrate it into the existing Canvas? Or keep it a separate class?
• If so, what is a good name?
• I now use reflection, with integer for UTF-32, char for UTF-8 or UTF-16 and string for all. But can also change it to use overloads.

[phil-scott-78]

Can't comment on anything besides the last bullet point - avoid reflection. With apt/trimming enabled now, you'll get warnings and a mess of headaches. Being explicit about the types is what you'll want