### Summary
* Optimized GetString by eliminating the intermediate string allocation.
** Note **: Encoding.GetChars() is still really inefficient, especially when strings are not aligned or have regular ascii/unicode characters. Thankfully we generally don't have to worry about these odd edge cases, but if they happen then GetChars can allocate hundreds of bytes.
This is a benchmark for just the related changes. NonSpecial are just ascii characters, while the other tests include control codes.
```cs
| Method | Mean | Error | StdDev | Gen0 | Allocated |
|------------------------------- |---------:|--------:|--------:|-------:|----------:|
| GetString | 306.7 ns | 5.96 ns | 6.86 ns | 0.0124 | 200 B |
| GetStringNotSpecial | 257.0 ns | 4.83 ns | 4.52 ns | 0.0114 | 184 B |
| GetStringSpanHelpers | 166.4 ns | 3.26 ns | 3.48 ns | - | - |
| GetStringSpanHelpersNotSpecial | 137.3 ns | 1.57 ns | 1.22 ns | - | - |
```
## Breaking Changes
Incoming packet registration signature has changed to:
```cs
delegate* void OnReceiveCallback(NetState state, SpanReader reader, int packetLength);
IncomingPackets.Register(int packetID, int length, bool ingame, OnReceiveCallback onReceive);
```
For example, an incoming packet handler signature would now look like this:
```cs
public static void SomeIncomingPacket(NetState state, SpanReader reader, int packetLength)
{
// Parse the data
}
```
## Summary
Updates the network Pipe class to use a mirrored memory technique. This technique involves mapping the same physical memory to two contiguous virtual memory spaces so the byte buffer appears duplicated. This allows writing to a double-sized array to wrap around without the need for the `CircularBuffer` classes.
In practice this allows us to use `Span<byte>` as if the buffer was a regular array.
### Bug Fixes
- [X] Fixes bad fixed length string parsing
**Only one functional change**
* Fixes a bug in LogFactory where `Warning` is being logged as `Information`
Non-functional changes:
* Updates/Fixes copyright headers
* Removes namespace scopes for core files.
View with [whitespace off](https://github.com/modernuo/ModernUO/pull/1187/files?w=1).
* Introduces `RawInterpolatedStringHandler` which is exactly the same as `DefaultInterpolatedStringHandler` except it _unsafely exposes_ it's `ReadOnlySpan<char>` buffer. This is useful for writing the string's data without actually building the string.
* Uses this new string interpolation handler in `SpanWriter` to eliminate intermediate strings built. This is immensely useful in eliminating string allocations in writing Gump packets.
