Replace round main with round in FHEM::Core::Utils::Math

[sidey79]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added / modified (needed for for bug fixes / features)
• commandref has been added / updated (needed for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Bugfix (please link issue)
• Feature enhancement
• Documentation update
• Unittest enhancement
• other

• What is the current behavior?
  (You can also link to an open issue here, if this describes the current behavior)

The round sub from 98_Utils isn't reliable, because it can be overriden via POSIX or Math::Round package.

• What is the new behavior (if this is a feature change)?

round from package FHEM::Core::Utils::Math is used which lives in a separate package and is not set into main

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

This module will stop working until fhem is updated to rev 27076 or newer:
https://svn.fhem.de/trac/browser/trunk/fhem/lib/FHEM/Core/Utils/Math.pm?rev=27076

• Other information:

[codecov]

Codecov Report

Merging #1154 (5e1beef) into master (261f202) will increase coverage by 0.34%.
The diff coverage is 89.58%.

@@            Coverage Diff             @@
##           master    #1154      +/-   ##
==========================================
+ Coverage   67.36%   67.70%   +0.34%     
==========================================
  Files         134      136       +2     
  Lines        9806     9829      +23     
  Branches     1571     1570       -1     
==========================================
+ Hits         6606     6655      +49     
+ Misses       1904     1879      -25     
+ Partials     1296     1295       -1     

Flag	Coverage Δ
fhem	57.37% <89.58%> (+0.42%)	⬆️
modules	67.70% <89.58%> (+0.34%)	⬆️
perl	90.33% <ø> (+0.16%)	⬆️
unittests	67.70% <89.58%> (+0.34%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
FHEM/14_SD_WS09.pm	75.89% <78.26%> (+0.53%)	⬆️
FHEM/00_SIGNALduino.pm	64.25% <100.00%> (+0.60%)	⬆️
FHEM/14_SD_AS.pm	56.25% <100.00%> (+0.34%)	⬆️
FHEM/14_SD_WS.pm	68.36% <100.00%> (+0.03%)	⬆️
t/FHEM/14_BresserTemeo/00_load.t
t/FHEM/10_SD_Rojaflex/09_parseData.t
t/FHEM/14_SD_UT/09_parseData.t	94.11% <0.00%> (ø)
t/FHEM/10_SD_GT/00_load.t	100.00% <0.00%> (ø)
t/FHEM/14_Hideki/00_load.t	100.00% <0.00%> (ø)
t/FHEM/14_SD_WS/09_parseData.t	94.11% <0.00%> (ø)
... and 3 more

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