CLC-3197 Refactor CalLink proxies to use generic exception handling
CLC-3197 Remove unused messaging from settings files
CLC-3197 Distinguish between expected and fatal proxy errors
CLC-3197 BearfactsProxy now uses generic exception handling
CLC-3197 Use sleeping threads spawned by a message processor to do delayed cache deletion
Merge pull request #2089 from ctweney/clc-3197-b

CLC-3197 Part 2: Smarter DelayedCacheCleaner impl, plus more proxies refactored