Data section containing non-numeric chars is parsed entirely as str

[kinverarity1]

Describe the bug
If the data section contains any non-numeric characters, all of it is parsed as str, instead of data types being per-column. This is the fundamental blocker to supporting many LAS 3 files in a useful way and has been touched on before e.g. #5 (comment)

To Reproduce
Steps to reproduce the behavior:

• See attached file:
  test_utah_well.las.txt
• Sourced from https://gdr.openei.org/submissions/1076

Expected behavior
Each curve in las.curves should have an appropriate data type. For the attached example, the curves Colour and Type should be type str and all the others should have type float, effectively.

Software versions (please complete the following information):

• Python version: N/A
• Python distribution N/A
• lasio version (import lasio; print(lasio.__version__)) master

[kinverarity1]

This has been resolved in master. This shows that the COLOUR and TYPE curves have been correctly interpreted as str and the remainder as float:

TDEP                              [7393.229222636634, 7394.201200198771]
AVGCALI                           [6.781719, 8.168356]
AZIMUTH                           [147.6105, 132.9622]
BREAKOUT_AZIMUTH_N                [nan, nan]
BREAKOUT_DIP_AZIMUTH              [nan, nan]
BREAKOUT_HEIGHT_N                 [nan, nan]
BREAKOUT_OMEGA_ANGLE_N            [nan, nan]
BREAKOUT_WIDTH_N                  [nan, nan]
CENTERED_DEPTH                    [7393.229, 7394.263]
COLOUR                            ['0.0', '#0000ff']
DIP_TRU                           [31.34024, 37.51989]
FMI_DYN_AZIMUTH                   [150.676, 134.433]
FMI_DYN_DIP_APP                   [29.1211, 34.88485]
FMI_DYN_DIPHEIGHT                 [0.3514086604118347, 0.5235607624053955]
FRACTURE_APERTURE[1]              [35.16279, 8.470589]
...
FVA                               [0.100928, 0.09125548]
FVAH                              [0.1446539, 0.1058358]
HAZI                              [290.1083, 291.5356]
HDEV                              [2.853298, 2.850765]
INDUCED_FRACTURE_AZIMUTH_N        [nan, nan]
INDUCED_FRACTURE_DIP_AZIMUTH      [nan, nan]
INDUCED_FRACTURE_HEIGHT_N         [nan, nan]
INDUCED_FRACTURE_OMEGA_ANGLE_N    [nan, nan]
INFOARRAY[1]                      [nan, 76.47171]
...
QUALITY                           [1.0, 1.0]
SHAPE                             [3.0, 3.0]
TERZAGHI_CORRECTION_FACTOR        [1.144722, 1.218981]
TYPE                              ['Conductive_Part_Resistive_Fracture', 'Conductive_Part_Resistive_Fracture']