prep SymbolEntry for new features, stop ignoring non-'file'-schema resources, stop ignoring result not getting a highlight

move the service to /browser/, add tests, support different way to adress line,column in fragment

fixes #10034

Fix #9922: Roll back PowerShell syntax definition

This change rolls back the PowerShell syntax definition file to a previous state before a major refactoring which introduced a lot of new issues.  Once these issues are fixed we will move back to the new definition.

Part of #9747

first step in fixing #9892

This reverts commit 3f446e49.

https://github.com/pugjs/pug formerly jade

fixes #9856

Fixes #9681

Fixes #9866