* General progress in setting up code paths to support GPU
premultiplication.
* Created `PremultiplyUpload` type to represent an initiated image
upload where the premultiply pass needs to be ran to complete it.
* Converted from compute pass to render pass since current limitations
make it difficult to write directly to a srgb image from a compute
shader.
* Replace `CachedDetails::Immutable` with keeping track of the
parameters used to create the texture (i.e. the border color).
* Create `TextureRequirements`, `TextureParamters`, and `CacheKey` types
to encode parameters that go into texture creation and image caching
and to determine when the space in texture memory should be reused
when replacing a graphic.
* Add custom texture creation logic for the UI textures since those need
certain usage combinations.
specifically rendering an image at the provided dimensions. Start
working on alpha premultipication which is necessary for being able to
properly sample colors on the GPU with bilinear filtering. Various
tweaks to comments and misc changes.
* Fix broken i18n keys for health and energy increases
* Better handle buff descriptions
Calculate infobox lines for item stats to set correct infobox frame
dimensions
* When client gets its view distance set by the server it stores that as
the max view distance allowed by the server.
* This is used to avoid skip sending requests if `set_view_distance` is
called with larger values.
* This is then also displayed in the UI via greying out the slider when
it goes past the limit and drawing another slide at the limit.
* The server clamping the client's view distance no longer leads to
edits in voxygen's view distance settings (the view distance setting
is instead preserved).
