* several thread palette extension fixes
* fix svg tartan when original shape is invalid
* tartan stroke spaces
* style
* fix tartan color substituion at pattern start
* ripple: do not render too small paths
* use less space for params warning headline
* fix clone shape path
* zip export template fix (typo)
* add realistic stitch plan output warning (help tab)
Setting the cache size to 0 bypasses the cache completely.
This is necessary during development to ensure newly-changed code actually gets run.
Also fixes the error pane in the params gui.
* make params warning pane large enough to see contents
* rename sizers in preferences dialog descriptive names
* add shapely version bound
* add option to disable stitch plan cache
* remove out-of-date wxg file
* make a cache size of 0 disable the cache
Kaalleen