Fix a few Graphics library issues (#2985)

Update the Sming-Graphics library with a few bug fixes.

- Replace image URLs with my own. Avoids attribution issues and problems with external servers 
- Fix graphic editor typename display, copy_as method signature
- Fix unused parameter warnings
- Fix abs() bug in drawing macros. Introduced in commit 89d315bd because clang doesn't provide constexpr abs().
- Fix `ReadStream` reads of more than 64 bytes
- Fix render debug statement
- Fix `SubStream::readMemoryBlock`, missing check on available bytes

- Revert #9c3031f3, virtual screen pointer size

Bad fix. `datalen` refers to content size and not size of address field. Needs a proper fix. Since this is only related to Host operation, perhaps avoid `writeDataBuffer`, `readStart` and `read` and instead use host-specific commands.

Author: mikee47