Image optimizations and corrections

* Optimized spinner gif
* WAY REDUCED tab-icon.jpg... even at 100% quality it's still smaller than the original :\
* Created alternate larger sizes for favicon
* Corrected favicon.ico to actually be an icon data type instead of png
* File permission corrections for exec bit on a few of these :\ *(this messes up gh a bit and also a security risk if a flaw is ever found in data formats that shouldn't be executables)*

Original 29.6KiB
Optimized minus new images: 27.7KiB *(__NOTE__ : .ico is bigger because it contains all the sizes like it's supposed to now instead of just one)*