macro pragmas: allowed on template defs, fixed for const

* constdef annotation handling same as identdefs in let or var
* template definitions allow annotation processing like other routine kinds

Details:
* reenabled `tests/pragmas/tpragmas_misc`
* updated manual for macros pragmas
* `semstmts.semConst` reworked to be like `semstmts.semLetOrVar`
* constdef annotation handling same as identdefs in let or var
* `semLetOrVarAnnotation` works on const defs, and renamed
* added tracing to `semTemplateDef`
* added tests for let/var section processing

Improvements based off of this PR: nim-lang/Nim#19406