* implement a fix for tags being found in code blocks

still needs polish, consider this a rough draft

* refactor to reuse a local function

uses CheckWrappedInCode to check that there are no code blocks that surround the tag being parsed

* Add more test coverage of MessageHelper.ParseTags

* reset indexes for @ here mention

* add a test case to catch error fixed from prev commit

* wip commit of most test cases working

* fix the Enclosed in block util method

* code cleanup

* lint whitespace

* lint brackets for single line if blocks

* move messagehelpertests to the new unit test dir

* expose internals to the unit test project

this seems to have been breaking the build, since CI would build the merged branch, where rest wasn't exposed to the unit tests