Fix the pow function when using floating point numbers

[Adriandmen]

Description

Since Elixir and Erlang do not supply their own implementation to support arbitrary precision with the :math.pow/2 function, we implemented our own pow method that handles arbitrary precision. However, when using floating point numbers, this may result in an infinite loop – most likely caused by the following line of code:

https://github.com/Adriandmen/05AB1E/blob/5ae97149e3e4758e39d351728ce013fd53f2f3c1/lib/commands/int_commands.ex#L81

This has now been fixed by including 0 as well to the range:

https://github.com/Adriandmen/05AB1E/blob/bb62507722e68af12123cf09d9a3ad7dda4721bd/lib/commands/int_commands.ex#L83

A failsafe check has been added as well before entering the recursive pow computation:

https://github.com/Adriandmen/05AB1E/blob/bb62507722e68af12123cf09d9a3ad7dda4721bd/lib/commands/int_commands.ex#L84

[codecov[bot]]

Codecov Report

Merging #169 into master will decrease coverage by 0.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   95.93%   95.76%   -0.17%     
==========================================
  Files          23       23              
  Lines        1794     1795       +1     
==========================================
- Hits         1721     1719       -2     
- Misses         73       76       +3     

Impacted Files	Coverage Δ
lib/commands/int_commands.ex	98.95% <100.00%> (+<0.01%)	:arrow_up:
lib/interp/functions.ex	93.25% <100.00%> (ø)
lib/commands/gen_commands.ex	94.23% <0.00%> (-1.93%)	:arrow_down:
lib/interp/commands/unary_interp.ex	98.87% <0.00%> (-0.57%)	:arrow_down:

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