v0.5.0

What's Changed

• Misc corrections by @davxy in #128
• Small PVM invocation fixes by @qiweiii in #130
• Refinement Context prerequisite is a set by @daiagi in #132
• Main alterations for 0.5 by @gavofyork in #135
• Misc corrections by @gavofyork in #133
• PVM Invocations: Improve & correct formalisms by @gavofyork in #141
• Include n_2 in epoch marker by @davxy in #146
• Merklisation: Accumulated buffer items are length-prefixed by @gavofyork in #147
• PVM Invocations: IsAuthorized and Refine are both entry points of zero by @gavofyork in #148

Full Changelog: v0.4.5...v0.5.0