--User changes

-Add a button to swap the pre and post affine values for all selected xforms.

--Bug fixes
 -Remove the ability to change spinner values with +=-=, it was conflicting with other things and added no real value.
 -All file dialog opening in Linux would freeze. No longer using native file dialogs, they are broken.
 -Set default open path to the desktop if there is no settings file present, which will be the case on the first run.
 -Amphibole_Supergroup.ugr palette had an invalid character in two of the palette names.

--Code changes
 -Change some table header padding styles to work with new Qt. Qss reload is required.
 -Ensure the open folder path setting always has a valid string in it before opening a folder.

Data/Amphibole_Supergroup.ugr

@@ -4976,9 +4976,9 @@ gradient:
 
 }
  
-Ferro-ferri-nyb<EFBFBD>ite {
+Ferro-ferri-nyboite {
 gradient:
- title="Ferro-ferri-nyb<EFBFBD>ite" smooth=no
+ title="Ferro-ferri-nyboite" smooth=no
  index=0 color=3032133
  index=2 color=2372156
  index=3 color=2239542
@@ -14670,9 +14670,9 @@ gradient:
 
 }
  
-Raw_Nyb<EFBFBD>ite {
+Raw_Nyboite {
 gradient:
- title="Raw_Nyb<EFBFBD>ite" smooth=no
+ title="Raw_Nyboite" smooth=no
  index=0 color=5076103
  index=2 color=3825246
  index=3 color=2970712