Style engine : style matching allocates a lot of memory even if everything is in cache

StyleProtoChain#getTypeHierarchy is called often and is responsible for a lot of unneeded memory allocations even if the type hierarchy is cached.

This patch has 2 parts :

• (1) : exception handling reworking in order to avoid the closure/activation creation by the try/catch
• (2) : replace the use of a flash proxy with a custom class : It seems that the proxy was only used as an array.