Make blurhash generation faster, add support for sending blurhashes
The blurhash implementation has been updated from Nheko, and the image provider has been switched to async. We noticed in Tokodon this made it slightly faster to generate blurhash images. The default resolution for blurhashes has been reduced to 64x64 as well.
Also adds support for sending blurhashes as well, since this new blurhash class has encoding support. Yay! Requires https://github.com/quotient-im/libQuotient/pull/700.
Fixes #483.
Edited by Joshua Goins