Several fixes in the lazread function.

[joa-quim]

It now reads 1.4 RGBI but maybe broke old formats.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 18.00000% with 41 lines in your changes missing coverage. Please review.

Project coverage is 85.85%. Comparing base (3047890) to head (fe59638).

Files with missing lines	Patch %	Lines
src/laszip/lazread.jl	18.36%	40 Missing ⚠️
src/laszip/laszip_h.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1764      +/-   ##
==========================================
+ Coverage   85.79%   85.85%   +0.05%     
==========================================
  Files         167      167              
  Lines       24042    24074      +32     
==========================================
+ Hits        20628    20669      +41     
+ Misses       3414     3405       -9     

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