Remove the need to calculate sqrt by using squared distance

[GilesBathgate]

Description

Minor performance tweak. When doing distance comparisons (c^2 = a^2+b^2), you can calculate c < 10, or you can do c^2 < 100.

Behaviour/ Breaking changes

Expect the same behaviour, and probably no noticeable performance gain, but still...

Have you tested the changes?

Yes, seems to work with MK3 as before.

[GilesBathgate]

Also note (f/5)^2 = f^2/5^2 ;)

[vintagepc]

Unfortunately the OSX compiler doesn't recognize that syntax:

/Users/runner/work/MK404/MK404/parts/components/PINDA.cpp:47:25: error: result of '10^2' is 8; did you mean '1e2'? [-Werror,-Wxor-used-as-pow]
                        if (fEdistSquared<(10^2))
                                           ~~^~
                                           1e2
/Users/runner/work/MK404/MK404/parts/components/PINDA.cpp:47:25: note: replace expression with '0xA ^ 2' or use 'xor' instead of '^' to silence this warning

[vintagepc]

... and more importantly, ^ is bitwise XOR, not "power"

[GilesBathgate]

@vintagepc Oh dear, schoolboy error. I've fixed it.

[codecov[bot]]

Codecov Report

Merging #342 (5a9e9c3) into master (c1a0c6b) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #342   +/-   ##
=======================================
  Coverage   91.14%   91.14%           
=======================================
  Files         166      166           
  Lines        7692     7692           
=======================================
  Hits         7011     7011           
  Misses        681      681           

Impacted Files	Coverage Δ
parts/components/PINDA.cpp	96.87% <100.00%> (ø)

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