Support numpy and float data types in MMIO read/write

[mariodruiz]

• Support for write/read floating point numbers
• Support for write/read numpy.uint32 and numpy.int32 numbers. Fix mmio.write() does not accept numpy.uint32 as type of data argument #634
• Merge write functionality in a single method
• MMIO.read arguments word_order and data_type are passed as keywords (**kwargs)
• Update test cases to verify new data types read/write operations

[codecov-commenter]

Codecov Report

Merging #1332 (2e8b909) into image_v2.8 (b85f453) will decrease coverage by 0.07%.
The diff coverage is 92.85%.

@@              Coverage Diff               @@
##           image_v2.8    #1332      +/-   ##
==============================================
- Coverage       46.47%   46.40%   -0.08%     
==============================================
  Files              28       28              
  Lines            4953     4950       -3     
  Branches          971      971              
==============================================
- Hits             2302     2297       -5     
- Misses           2594     2595       +1     
- Partials           57       58       +1     

Impacted Files	Coverage Δ
pynq/mmio.py	97.46% <92.30%> (-2.54%)	⬇️
pynq/overlay.py	33.63% <100.00%> (ø)

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