Changes

Summary

1. Amiga: Use default built-in tab close gadget on intuition v54 (details)
2. Amiga: Fix a typo and the destination clip for bitmap tiling (details)
3. Amiga: Reduce task priority to -1 Keeps Workbench responsive whilst (details)
4. Amiga: remove tab_last (details)
5. Amiga: Switch out new tab button for a + tab (details)
6. Amiga: Remove add tab bitmap (details)

Commit 2deca788be5a858cea1d46405078cc2d645e3f65 by chris Amiga: Use default built-in tab close gadget on intuition v54
	frontends/amiga/gui.c (diff)
Commit a43cede005283b727b24b48d5aee73cb7a23aacc by chris Amiga: Fix a typo and the destination clip for bitmap tiling
	frontends/amiga/plotters.c (diff)
Commit 0d388b69c4fd18289ddfd79b7f23fad8e54de299 by chris Amiga: Reduce task priority to -1 Keeps Workbench responsive whilst NetSurf is processing
	frontends/amiga/resources/Themes/AISS/NetSurf.info (diff)
	frontends/amiga/resources/Themes/Default/NetSurf.info (diff)
Commit c5e1a5a7cf02a0c031fa4fa1c4772c0fd40c277a by chris Amiga: remove tab_last
	frontends/amiga/gui.c (diff)
	frontends/amiga/options.h (diff)
	frontends/amiga/gui_options.c (diff)
Commit b005a5d49fc9fe87cd8b088121b067e9f1db3097 by chris Amiga: Switch out new tab button for a + tab
	frontends/amiga/gui.c (diff)
Commit c3338e7826b710821207de3a608a21a8af0848b3 by chris Amiga: Remove add tab bitmap
	frontends/amiga/gui.c (diff)