Improve Exception Library

Release 0.15.10

STPException (#47)

• Reclassify exception categories including breaking vague exceptions into a smaller, more clearer exceptions, as well as removing unused exceptions.
• All STPExceptions now provide basic source information to aid with debugging.
• Exception details are broken down based on exception types and separate each piece of information as member variable in the exception class.
• Most exceptions now provide a macro for easier creation.
• Support assertion exception that is similar to C assert but works in release mode as well.

General fixes and improvement

• Fixing compiler errors in test program.
• Add documentation for single histogram filter.
• Add information for citation.

STPWorldPipeline

• Incorrect use of neighbour local chunk index coordinate offset as world coordinate offset for splatmap generation.
• Incorrect assumption about main chunk request response and force heightmap reload response that they are subset of each other, in fact they might be disjoint. This causes some chunks are not correctly loaded.
• A mistake for not waiting for the last batch of work to complete and causes a race condition at the end of the erosion work launcher.
• Fix a case where chunks are not updated when the camera is moving too fast, such that the old loading request is discarded.