This includes updating all usages of symbol as a security identifier to use the new type.
The type includes a unique field, SID, as well as the current ticker's value. This allows
for consistent addressability while also allowing the ticker to evolve over time with the
mapping changes.
Effort was made to maintain compile and runtime backwards compatibility.
Uses the insanely mental GOOG,GOOGL,GOOCV,GOOAV case
Correctly starts with GOOG and adds GOOAV and GOOCV, later we can model the merge of GOOAV->GOOG pre GOOGL
snugs