Remove hrenginaudio

Moved code based on proprietary third-party library out of this repo.
Merge branch 'master' of https://github.com/Huddayn/hengine
Common: Update Vector2d (paths, headerguard)

Vector2d is not used anywhere in code, so it had been out of date.

I updated include paths and headerguard to match the new convention.
Also changed comparison operators behavior (now compare sums of
coordinates instead of sums of squares of coordinates), although I am
thinking of deleting those (see notice in Vector2d.h)
Filesystem: Add HDF Types header

Added HdfTypes.h, with enum of standard types and non-member type
validaion helper functions.
Filesystem: Update HDF parser (WIP)

in HdfTypes.h:
o removed 'HdfToken',
o no need in enable_if -- simplified templates

Completely rewritten CHndfParser, unfinished, still lacking some methods.
Filesystem: Clean up HDF parser

Cleaned up old junk, and finished writing all crucial.
Workability is not tested.
Merge branch 'master' of https://github.com/Huddayn/hengine