BoolRegister with mask and RegisterWithConversion with sign

[sonelu]

Now BoolRegister can have an attached mask and a rule of masking.
RegisterWithConversion can now have a defined sign bit - useful for registers in 2's complement
Registers can now be duplicated and use different external rules by marking them as "clone".

Fixes #34
Fixes #44
Fixes #45

[codecov]

Codecov Report

Merging #46 into master will increase coverage by 1.86%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
+ Coverage   92.18%   94.04%   +1.86%     
==========================================
  Files          24       24              
  Lines        1765     1813      +48     
  Branches      231      244      +13     
==========================================
+ Hits         1627     1705      +78     
+ Misses        101       81      -20     
+ Partials       37       27      -10     

Impacted Files	Coverage Δ
roboglia/base/device.py	100.00% <100.00%> (+4.00%)	⬆️
roboglia/base/register.py	100.00% <100.00%> (+5.51%)	⬆️
roboglia/dynamixel/bus.py	91.62% <0.00%> (+0.98%)	⬆️
roboglia/base/joint.py	100.00% <0.00%> (+4.65%)	⬆️
roboglia/base/robot.py	100.00% <0.00%> (+5.88%)	⬆️

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