Resolves #49 Random values as response

[murvar]

• Added functionality for using RANDOM with setters. Checks correct type and randomizes value from device properties.
• Minor spelling fix.

To use RANDOM, query a setter with RANDOM instead av value.

[codecov-commenter]

Codecov Report

Merging #63 (35ccd02) into master (0b8bb01) will decrease coverage by 0.90%. The diff coverage is 23.07%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
- Coverage   86.63%   85.72%   -0.91%     
==========================================
  Files          15       14       -1     
  Lines         995     1002       +7     
==========================================
- Hits          862      859       -3     
- Misses        133      143      +10     

Flag	Coverage Δ
unittests	85.72% <23.07%> (-0.91%)	:arrow_down:

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

Impacted Files	Coverage Δ
pyvisa_sim/component.py	89.52% <23.07%> (-9.41%)	:arrow_down:
pyvisa_sim/__init__.py

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[MatthieuDartiailh]

Closed by #96