fix accepted chars in Name

fix dtd errors add tests

fix entity value bug

add dtd tests & fixes

move dtd checks to another file

dtd checks complete

ProcessingInstructions inside document, start improving DTD validation

cargo check warnings

provide namespace awareness option with builder pattern, fix empty element event

update readme

fix tests, bump version

refactor stag emptyelemtag

start attributes without new heap allocations

growing buffer when necessary, cargo fix

remove the old buffer