Implement MxVector2/3/4 and MxMatrix (#100)

* All of the MxVectors share an inheritance chain. MxVector4 inherits
  from MxVector3 which inherits from MxVector2.

* They all operate on a shared `float*` data member which points to the
  underlying storage.

* There are also MxVector3/4Data classes, which inherit from Vector3/4,
  but add concrete storage for the Vector data rather than just an
  abstract data pointer.

* The same is true for MxMatrix, with there being an abstract and a
  concrete variant of it.

* Also improve reccmp.py register matching algorithm. It previously
  could not recognize an effective match when a swap had to take place
  between two registers used on the same line. It turns out this happens
  a lot in floating point math code so I adjusted the implementation to
  break the disassembly lines on spaces rather than just linebreaks
  allowing the existing effective match code to handle that case too.

tools/reccmp/reccmp.py

@@ -343,14 +343,15 @@ def replace_register(lines: list[str], start_line: int, reg: str, replacement: s
 
 # Is it possible to make new_asm the same as original_asm by swapping registers?
 def can_resolve_register_differences(original_asm, new_asm):
+  # Split the ASM on spaces to get more granularity, and so
+  # that we don't modify the original arrays passed in.
+  original_asm = [part for line in original_asm for part in line.split()]
+  new_asm = [part for line in new_asm for part in line.split()]
+
   # Swapping ain't gonna help if the lengths are different
   if len(original_asm) != len(new_asm):
     return False
 
-  # Make copies so we don't modify the original
-  original_asm = original_asm.copy()
-  new_asm = new_asm.copy()
-
   # Look for the mismatching lines
   for i in range(len(original_asm)):
     new_line = new_asm[i]