Visualization - add NCollection_Mat3 for 3x3 matrix similar to NCollection_Mat4

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Detailed log of new commits:

Author: Author
Date: Fri Apr 9 12:16:55 2021 +0300

    0032289: Visualization - add NCollection_Mat3 for 3x3 matrix similar to NCollection_Mat4
    
    Introduced NCollection_Mat3 class similar to NCollection_Mat4.
    Added NCollection_Mat4::operator() alias to NCollection_Mat4::Value().
    Added NCollection_Mat4::Negated(), ::Subtracted(), ::Added(), ::Divided() operations.
    Added a note to NCollection_Mat4::GetData() that matrix values are stored in column-major order.
    Removed duplicated operator== operators from NCollection_Mat4/NCollection_Vec4/NCollection_Vec3/NCollection_Vec2 classes.

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Patch is ready for review
- OCCT: branch CR32289.

http://jenkins-test-12.nnov.opencascade.com:8080/view/CR32289-master-KGV/

The patch was reviewed

Combination -
OCCT branch : [archived branch]
master SHA - [revision removed]
[revision removed]
Products branch : [archived branch] SHA - [revision removed]
was compiled on Linux, MacOS and Windows platforms and tested in optimize mode.

Number of compiler warnings:
No new/fixed warnings

Regressions/Differences/Improvements:
No regressions/differences

CPU differences:
Debian80-64:
OCCT
Total CPU difference: 18019.250000000382 / 18057.390000000454 [-0.21%]
Products
Total CPU difference: 11542.82000000007 / 11506.800000000105 [+0.31%]
Windows-64-VC14:
OCCT
Total CPU difference: 19509.84375 / 19513.828125 [-0.02%]
Products
Total CPU difference: 12890.46875 / 12943.234375 [-0.41%]


Image differences :
No differences that require special attention

Memory differences :
No differences that require special attention

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