Fixed-point function restoration.

Some of these were removed a long time ago because reasons, and some were rewritten to use floats.
Add any missing, and de-float them.

* [x] `BrFixedAbs` - https://github.com/BlazingRenderer/BRender/commit/b93f5313bede1a0f34a72c21ad472007d9b59814
* [x] `BrFixedMul`
* [x] `BrFixedMac2` - https://github.com/BlazingRenderer/BRender/commit/8570937bf34345b816dea60e0eef687a103a5f73
* [x] `BrFixedMac3` - https://github.com/BlazingRenderer/BRender/commit/8570937bf34345b816dea60e0eef687a103a5f73
* [x] `BrFixedMac4` - https://github.com/BlazingRenderer/BRender/commit/8570937bf34345b816dea60e0eef687a103a5f73
* [x] `BrFixedSqr`
* [x] `BrFixedSqr2`
* [x] `BrFixedSqr3`
* [x] `BrFixedSqr4`
* [x] `BrFixedLength2` - https://github.com/BlazingRenderer/BRender/commit/f5703af80d347301ad64f1942b181a6741eac508
* [x] `BrFixedLength3` - https://github.com/BlazingRenderer/BRender/commit/f5703af80d347301ad64f1942b181a6741eac508
* [x] `BrFixedLength4` - https://github.com/BlazingRenderer/BRender/commit/f5703af80d347301ad64f1942b181a6741eac508
* [x] `BrFixedRLength2` - https://github.com/BlazingRenderer/BRender/commit/73cc6caeb1c861fd04bd804e9f07d26a541881b2
* [x] `BrFixedRLength3` - https://github.com/BlazingRenderer/BRender/commit/73cc6caeb1c861fd04bd804e9f07d26a541881b2
* [x] `BrFixedRLength4` - https://github.com/BlazingRenderer/BRender/commit/73cc6caeb1c861fd04bd804e9f07d26a541881b2
* [x] `BrFixedDiv` - https://github.com/BlazingRenderer/BRender/commit/45d37e4e781a65c1cabcc49ac27c05b3ad7002c4
* [ ] `BrFixedDivF`
* [ ] `BrFixedDivR`
* [ ] `_FixedDivP`
* [ ] `BrFixedMulDiv`
* [ ] `BrFixedMac2Div`
* [ ] `BrFixedMac3Div`
* [ ] `BrFixedMac4Div`
* [x] `BrFixedRcp` - https://github.com/BlazingRenderer/BRender/commit/121d844cddb454d05fc761845b7afde1038ccba1
* [x] `BrFixedFMac2` - https://github.com/BlazingRenderer/BRender/commit/bc4cbea54b533f0fca066235574864e0cb65f211
* [x] `BrFixedFMac3` - https://github.com/BlazingRenderer/BRender/commit/bc4cbea54b533f0fca066235574864e0cb65f211
* [x] `BrFixedFMac4` - https://github.com/BlazingRenderer/BRender/commit/bc4cbea54b533f0fca066235574864e0cb65f211
* [x] `BrFixedSin` - https://github.com/BlazingRenderer/BRender/commit/4a6e247ddaec27886031863c44388aa278c0bf55
* [x] `BrFixedCos` - https://github.com/BlazingRenderer/BRender/commit/4a6e247ddaec27886031863c44388aa278c0bf55
* [x] `BrFixedASin` - https://github.com/BlazingRenderer/BRender/commit/6e7192473392b93ce356b0c9d58fd15e85bef1ef
* [x] `BrFixedACos` - https://github.com/BlazingRenderer/BRender/commit/faf0959d3834219a0ea47d397fdf95d36db188e5
* [x] `BrFixedATan2` - https://github.com/BlazingRenderer/BRender/commit/32de580e59b69bcf99c82bd5068eebdbf47ac89a
* [ ] `BrFixedATan2Fast`
* [x] `BrFixedSqrt`
* [x] `BrFixedPow`


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Fixed-point function restoration. #36

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Fixed-point function restoration. #36

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