Combining and generalising demo code

• Combined all the dimensions for StdProject and StdProject_Diff demos into one universal StdProject file
• Edited input arguments to take text instead of enum indices, for example: -s Tetrahedron -b Ortho_A Ortho_B Ortho_C -o 6 6 6 -p 7 7 7
• Added additional argument to allow for selection of points change, for example -s Segment -b Modified_A -o 6 -p 7 -P Gauss
• Used above to add additional test for !998 (merged) regression
• Removed old demo files & updated CMakeLists to represent this change
• Altered all test cases to use the new input arguments - expected result and tolerances have been unchanged
• As above for LocProject
• Generalised the geometry creation into a single function