After experiments with loading the whole file at once, and
with decoding and parsing in separate thread, lazy reader
turned to be the fastest/least memory intensive solution.
Characters are now decoded in small batches.
This improved parsing speed by ~20%.
No global state anymore. Anchors are now zero terminated strings
and TagDirectives are a simple array. Event structure was changed
to prevent size increase.
Minor fixes and improvements.
slowdown and a slight memory usage increase. Fixed a potential
bug in Reader. Tag is now implemented as a zero-terminated
string, removing the need for global state.
Node opIndex now returns a reference.
Removed endMark from Node to keep it in 32 bytes on 64bit.
This will result in slightly worse debugging messages, but we
still have the start position of a node.
Tag is needed for better compliance with the spec and emitting
support for multiple tags with the same D data type.
