Support for up to 2 bytes per label

[Krixtalx]

This pull request includes changes to the PcdReader.cs file to improve the handling of label sizes and update the Point3D structure. The most important changes include adding support for different label sizes and modifying the Point3D structure to accommodate these changes.

Improvements to label size handling:

• PcdReader.cs: Added a check for label size and assigned the appropriate size based on the field's size in ReadBinaryData method.
• PcdReader.cs: Added support for label sizes of 2 and 4 bytes in the ReadBinaryData method, allowing the conversion of bytes to UInt16 and UInt32 respectively.

Updates to Point3D structure:

• PcdReader.cs: Changed the label field in the Point3D structure from byte to UInt16 to support larger label sizes.