Cache our compat lookups for our message webview - (They're expensive on
older devices - and pointless not to reuse)
upgrade our android-support library in the hopes that the newer version
might fix some perf issues with the older one
Don't invalidate the options menu from the message list as we open a
message. We also invalidate it (twice) as we show the message. It turns
out to have measurable performance impact on 2.3 thanks to ABS