feat: implement cinfo packet

fix: implement IPacket in use skill packets

chore: update packets version

docs(packets): add missing documentation

feat(packets): add missing hitmode

feat: make projects available for netstandard 2.1

feat(packets): add entities and maps packets

chore: make serializer generator correctly output to nuget

chore: add repository url and license to nuget

docs: add documentation for missing fields

chore: add nuget description

fix(packets): syntax error in generator

fix(packets): deserialize strings starting with "-" correctly

fix(packets): use skill vnum instead of id to avoid confustion between cast id and skill vnum

feat(packets)!: let the user add the default packet converters

fix(packets): make correct fields nullable

feat(serializer): fix null representation as stated in #18

fix(packets): make cmode morph skin allow higher values

chore: remove debug stuff from source generator

feat: split packets definitions into separate assembly