SH-24114 Remove unused vectorization code (outdated/unused with SSE2 requirement and llvetor4a et al)

and SH-2358: Crash in LLError::crashAndLoop: Invalid face index

reviewed by Leslie

SH-2188 Fix for generally bad vertex buffer updates for rigged attachments and fix for viewer always thinking meshes initially have 8 texture entries.

Removed dynamic allocation on mVariables and mConstants
CS cleanup

Support for floor, ceil, modulo.
Fixed ABS.
Added more constants, SQRT_TWO_PI and SQRT3

SH-1891: viewer crashes while previewing "RYOMA 3D XML File.dae";
SH-1890: Crash loading palm tree

linux caught the fact that we're using an integer absolute value function
when we should be using a floating-point version.

SH-828 Fix for using uninitialized data when normals or texture coordinates are absent from collada file (can now upload meshes without normals or texture coordinates).

when fasttimers are amazingly consistent, we remove all data as outliers
instead of removing nothing. Probably something else going on here,
but this should fix the crash so we can analyze better.

SH-1359 General octree tune-up -- increase maximum capacity of an octree node and rework requested octree node sizes for minimum triangles per frame and maximum triangles per drawing call.

reviewed by davep.

Updated header blocks for llphysicsshapebuilderutil classes.

Parenthisized a #define to make it safer, adjusted some notes (and added a TODO) around some extremely obscure code that needs further attention but which is outside this scope.