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

library/Demos/LocalRegions/Tests/LocProject1D_Mod_Basis_P6_Q7.tst

 <?xml version="1.0" encoding="utf-8"?>
 <test>
     <description>Project1D Segment Modified basis P=6 Q=7</description>
-    <executable>LocProject1D</executable>
-    <parameters>4 6 7 0.0 1.0</parameters>
+    <executable>LocProject</executable>
+    <parameters>-s segment -b Modified_A -o 6 -p 7 -c 0.0 1.0</parameters>
     <metrics>
         <metric type="L2" id="1">
             <value tolerance="1e-12"> 2.22438e-15</value>