Convert assets to CLX

Converted using the following commands:

```
cd Packaging/resources/assets
pcx2clx --transparent-color 1 --num-sprites 256 fonts/*.pcx && rm fonts/*.pcx
pcx2clx --num-sprites 2 ui_art/dvl_but_sml.pcx && rm ui_art/dvl_but_sml.pcx
pcx2clx --transparent-color 1 data/hintbox.pcx data/hintboxbackground.pcx && rm data/hintbox.pcx data/hintboxbackground.pcx
pcx2clx --transparent-color 1 --num-sprites 6 data/hinticons.pcx && rm data/hinticons.pcx
pcx2clx --num-sprites 2 data/panel8buc.pcx data/dirtybuc.pcx data/dirtybucp.pcx && rm data/panel8buc.pcx data/dirtybuc.pcx data/dirtybucp.pcx
pcx2clx --transparent-color 1 data/healthbox.pcx && rm data/healthbox.pcx
pcx2clx --transparent-color 1 --num-sprites 6 data/resistance.pcx && rm data/resistance.pcx
pcx2clx --transparent-color 1 --num-sprites 5 data/monstertags.pcx && rm data/monstertags.pcx
pcx2clx --transparent-color 1 data/stash.pcx && rm data/stash.pcx
pcx2clx --transparent-color 1 --num-sprites 5 data/stashnavbtns.pcx && rm data/stashnavbtns.pcx
pcx2clx **/*.pcx && rm **/*.pcx
git checkout master -- ui_art/black_diablo.pcx ui_art/black_hellfire.pcx data/charbg.pcx data/talkbutton.pcx data/panel8bucp.pcx
rm ui_art/black_diablo.clx ui_art/black_hellfire.clx data/charbg.clx data/talkbutton.clx data/panel8bucp.clx
```

CMake/Assets.cmake

@@ -41,107 +41,107 @@ if (Gettext_FOUND)
 endif()
 
 set(devilutionx_assets
-  data/boxleftend.pcx
-  data/boxmiddle.pcx
-  data/boxrightend.pcx
+  data/boxleftend.clx
+  data/boxmiddle.clx
+  data/boxrightend.clx
   data/charbg.pcx
-  data/dirtybuc.pcx
-  data/dirtybucp.pcx
-  data/healthbox.pcx
-  data/health.pcx
-  data/hintbox.pcx
-  data/hintboxbackground.pcx
-  data/hinticons.pcx
-  data/monstertags.pcx
-  data/panel8buc.pcx
+  data/dirtybuc.clx
+  data/dirtybucp.clx
+  data/healthbox.clx
+  data/health.clx
+  data/hintbox.clx
+  data/hintboxbackground.clx
+  data/hinticons.clx
+  data/monstertags.clx
+  data/panel8buc.clx
   data/panel8bucp.pcx
-  data/resistance.pcx
-  data/stash.pcx
-  data/stashnavbtns.pcx
+  data/resistance.clx
+  data/stash.clx
+  data/stashnavbtns.clx
   data/talkbutton.pcx
-  data/xpbar.pcx
+  data/xpbar.clx
   fonts/12-00.bin
-  fonts/12-00.pcx
+  fonts/12-00.clx
   fonts/12-01.bin
-  fonts/12-01.pcx
+  fonts/12-01.clx
   fonts/12-02.bin
-  fonts/12-02.pcx
+  fonts/12-02.clx
   fonts/12-03.bin
-  fonts/12-03.pcx
+  fonts/12-03.clx
   fonts/12-04.bin
-  fonts/12-04.pcx
-  fonts/12-1f4.pcx
-  fonts/12-1f6.pcx
-  fonts/12-1f9.pcx
+  fonts/12-04.clx
+  fonts/12-1f4.clx
+  fonts/12-1f6.clx
+  fonts/12-1f9.clx
   fonts/12-20.bin
-  fonts/12-20.pcx
-  fonts/12-26.pcx
+  fonts/12-20.clx
+  fonts/12-26.clx
   fonts/22-00.bin
-  fonts/22-00.pcx
+  fonts/22-00.clx
   fonts/22-01.bin
-  fonts/22-01.pcx
+  fonts/22-01.clx
   fonts/22-02.bin
-  fonts/22-02.pcx
+  fonts/22-02.clx
   fonts/22-03.bin
-  fonts/22-03.pcx
+  fonts/22-03.clx
   fonts/22-04.bin
-  fonts/22-04.pcx
+  fonts/22-04.clx
   fonts/22-05.bin
-  fonts/22-05.pcx
+  fonts/22-05.clx
   fonts/22-20.bin
-  fonts/22-20.pcx
+  fonts/22-20.clx
   fonts/24-00.bin
-  fonts/24-00.pcx
+  fonts/24-00.clx
   fonts/24-01.bin
-  fonts/24-01.pcx
+  fonts/24-01.clx
   fonts/24-02.bin
-  fonts/24-02.pcx
+  fonts/24-02.clx
   fonts/24-03.bin
-  fonts/24-03.pcx
+  fonts/24-03.clx
   fonts/24-04.bin
-  fonts/24-04.pcx
-  fonts/24-1f4.pcx
-  fonts/24-1f6.pcx
-  fonts/24-1f9.pcx
+  fonts/24-04.clx
+  fonts/24-1f4.clx
+  fonts/24-1f6.clx
+  fonts/24-1f9.clx
   fonts/24-20.bin
-  fonts/24-20.pcx
-  fonts/24-26.pcx
+  fonts/24-20.clx
+  fonts/24-26.clx
   fonts/30-00.bin
-  fonts/30-00.pcx
+  fonts/30-00.clx
   fonts/30-01.bin
-  fonts/30-01.pcx
+  fonts/30-01.clx
   fonts/30-02.bin
-  fonts/30-02.pcx
+  fonts/30-02.clx
   fonts/30-03.bin
-  fonts/30-03.pcx
+  fonts/30-03.clx
   fonts/30-04.bin
-  fonts/30-04.pcx
+  fonts/30-04.clx
   fonts/30-20.bin
-  fonts/30-20.pcx
+  fonts/30-20.clx
   fonts/42-00.bin
-  fonts/42-00.pcx
+  fonts/42-00.clx
   fonts/42-01.bin
-  fonts/42-01.pcx
+  fonts/42-01.clx
   fonts/42-02.bin
-  fonts/42-02.pcx
+  fonts/42-02.clx
   fonts/42-03.bin
-  fonts/42-03.pcx
+  fonts/42-03.clx
   fonts/42-04.bin
-  fonts/42-04.pcx
+  fonts/42-04.clx
   fonts/42-20.bin
-  fonts/42-20.pcx
+  fonts/42-20.clx
   fonts/46-00.bin
-  fonts/46-00.pcx
+  fonts/46-00.clx
   fonts/46-01.bin
-  fonts/46-01.pcx
+  fonts/46-01.clx
   fonts/46-02.bin
-  fonts/46-02.pcx
+  fonts/46-02.clx
   fonts/46-03.bin
-  fonts/46-03.pcx
+  fonts/46-03.clx
   fonts/46-04.bin
-  fonts/46-04.pcx
+  fonts/46-04.clx
   fonts/46-20.bin
-  fonts/46-20.pcx
+  fonts/46-20.clx
   fonts/black.trn
   fonts/blue.trn
   fonts/buttonface.trn
@@ -154,21 +154,21 @@ set(devilutionx_assets
   fonts/whitegold.trn
   fonts/white.trn
   fonts/yellowdialog.trn
-  gendata/cutportlw.pcx
-  gendata/cutportrw.pcx
-  gendata/cutstartw.pcx
+  gendata/cutportlw.clx
+  gendata/cutportrw.clx
+  gendata/cutstartw.clx
   Levels/L1Data/SklKngT.dun
   Levels/L2Data/BonechaT.dun
   NLevels/L5Data/cornerstone.dun
   NLevels/L5Data/uberroom.dun
   ui_art/black_diablo.pcx
   ui_art/black_hellfire.pcx
-  ui_art/creditsw.pcx
-  ui_art/dvl_but_sml.pcx
-  ui_art/dvl_lrpopup.pcx
-  ui_art/hf_titlew.pcx
-  ui_art/mainmenuw.pcx
-  ui_art/supportw.pcx)
+  ui_art/creditsw.clx
+  ui_art/dvl_but_sml.clx
+  ui_art/dvl_lrpopup.clx
+  ui_art/hf_titlew.clx
+  ui_art/mainmenuw.clx
+  ui_art/supportw.clx)
 
 if(NOT USE_SDL1 AND NOT VITA)
   list(APPEND devilutionx_assets