BETA

* add castbar uninterruptible shield (with a new texture)
* add option for classpowers vertical offset
* add option for castbar shield size (not exposed)
* change target arrows texture again
* increase default target arrows inset
* target arrows no longer avoid the spell icon
* target arrows now ignore alpha
* bottom component of target glow now ignores alpha
* increase default spell text vertical offset
* increase default castbar size slightly
* reduce bar spark frame level

