ETABS_Toolkit: Read concrete strength

[JosefTaylor]

Description:

ETABS uses Cylinder strength, so when we read a material we should set the cylinder strength to the Specified Compressive Strength from ETABS. Also, let's check that when pushing materials, we set F'c to the BHoM Cylinder Strength.

[RichardWhitfieldTTW]

Unless this is on a version which hasn't been pushed yet I'm still not reading the concrete strength (see image). I thought that I made a modification for this a while ago. Happy to look at it in the new year if it's still not there.

[IsakNaslundBh]

Unless this is on a version which hasn't been pushed yet I'm still not reading the concrete strength (see image). I thought that I made a modification for this a while ago. Happy to look at it in the new year if it's still not there.

@RichardWhitfieldTTW This should have been resolved in https://github.com/BHoM/ETABS_Toolkit/pull/211/files . Master branch after this was merged should be able to pull concrete strength.