Replace cdf! macro with const fns

[FreezyLemon]

Notable changes:

• cdf! always required the parameter count to be == CDF_LEN - 1, the new cdf function accepts any parameter count < CDF_LEN. Any values after the last parameter will be zero. (e.g. if the output has a length of 8 and the parameter count is 5, then the output values 6 to 8 will be zero). This means:

  let test: [u16; 4] = cdf!(123); // Error: Number of parameters must be exactly (4 - 1)
  let test: [u16; 4] = cdf([123]); // Works: test == [some_value, 0, 0, 0]

• Added helper functions for multi-dimensional arrays (up to 5D) to avoid spamming the cdf macro/fn

  [
    cdf!(123, 456, 789),
    cdf!(987, 654, 321),
    // ...
  ]

  will become

  cdf_2d([
    [123, 456, 789],
    [987, 654, 321],
    // ...
  ])

  and so on.

• Check all input parameters to be in the range [0, 32768] to avoid underflows in 32768 - val

• Fully replaced macro with generic code. Type safety is ensured through the function signatures and compile-time assert! statements

The code for cdf_2d, cdf_3d etc. is a little messy. But it's the best way I found to keep these const without some sort of macroized implementation (which seems a bit overkill for just 5 similar functions).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d555dc8) 88.48% compared to head (d57026b) 88.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3334      +/-   ##
==========================================
+ Coverage   88.48%   88.52%   +0.04%     
==========================================
  Files          88       89       +1     
  Lines       28231    28334     +103     
==========================================
+ Hits        24981    25084     +103     
  Misses       3250     3250              

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[lu-zero]

Looks very good! Thank you