* Invert `#if NET5_0` conditions so that when adding net6.0 target framework, the _new_ APIs are used.
* Use `NET5_0_OR_GREATER` instead of `NET5_0` to ensure consistent behaviour on future target frameworks.
If an application runs on Windows 10.0.15063 or above, on a
runtime prior to net5.0, the color system detection will fail
and fall back to 8-bit color support.
The reason for this is because the behavior of
Environment.OSVersion.Version differs between runtimes. Unless you're
running on net5.0, both the major and build version components will
not reflect those in the actual Windows version.
When running .NET Core 2.1 or .NET Framework 4.6.1, the used regex for
detecting Windows 10 TrueColor support does not match the OSDescription.
The reason for this is because on those frameworks the description has
trailing whitespaces, but they do not on .NET Core 3.1.
This commit updates the regex to ignore any trailing whitespaces.
- A `Text` object should not be able to justify itself.
All justification needs to be done by a parent.
- Apply colors and styles to part of a `Text` object
- Markup parser should return a `Text` object
