* Breaking parser changes, implement https://github.com/nim-lang/RFCs/issues/442
Types are separated from expressions and better reflected in the grammar.
* add test
* more accurate grammar
* fix keyword typedescs
* accept expressions in proc argument lists
* CI "fixes"
* fixes
* allow full ref expressions again, adapt old tests
* cleanup, fix some tests
* improve grammar, try and revert semtypes change
* restrict sigil binding to identOrLiteral
* fix, should have caught this immediately
* add changelog entry, fix double not nil bug
* correct grammar
* change section
* fix
* real fix hopefully
* fix test
* support LL(1) for tuples
* make grammar.txt too
* Error -> Defect for defects
The distinction between Error and Defect is subjective,
context-dependent and somewhat arbitrary, so when looking at an
exception, it's hard to guess what it is - this happens often when
looking at a `raises` list _without_ opening the corresponding
definition and digging through layers of inheritance.
With the help of a little consistency in naming, it's at least possible
to start disentangling the two error types and the standard lib can set
a good example here.
