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s2dInstance stuff updated to use slTexRef

See merge request !26

Additional slTexRef conversions, etc.

See merge request !25

Resolve "Eliminate GC step for ref-counted resources"

Closes #36

See merge request !23

Look up textures in the tree and get rid of the old list, and the allocator. Also, get rid of the slightly optimized but way more complicated "inline"/"extern" concept for images.

Fix use-after-free bug, which went unnoticed because it only seemed to be...

See merge request !24

Fix use-after-free bug, which went unnoticed because it only seemed to be caught when running with GDB.

slTreeSet - remove function implemented, code added to keep track of counts (mainly for sanity checking to compare against Recount's return value)

Mirroring the factory-specific list manipulation needing to be synchronized during texture creation, make sure to also call the factory free function inside the mutex.

Resolve "Asynchronous model loading"

Closes #15

See merge request !14

glFinish (not just Flush) before allowing textures to be used, also. Increment meshcount as each mesh is uploaded instead of waiting until the whole mesh is available to mark the model as ready to draw.

Got Slice3D uploading models via the BackgroundUploader for a significantly more fluid user experience while even huge models are uploading. One catch is that while buffer data can be uploaded in the UploadContext, vertex arrays aren't shared.

Moved more code off the main thread, but it turns out what takes the longest time is the GL calls to upload the data.

Keep track of which models were loaded from where, to avoid re-loading duplicates from the same file path.

Add new variant of slStrClone and slStrConcat that always allocate even for empty strings. Sure it may use memory sometimes when not absolutely necessary, but it cuts down on weird edge cases having to be handled by calling code.

Resolve "3D models with no texture coordinates don't render properly"

Closes #43

See merge request !22