Also small config addition to optionally increase memory allocation size
for temporary texture pixel data; the nouveau drivers seem notoriously
awkward and keep writing over the buffer.
- Removed some unused member variables.
- The BBGE_BUILD_WIDESCREEN define is now gone.
- Added an TiXMLDocument cache to prevent parsing the same file
once for each entity on the map with the same skeletal.
- Removed Lua func entity_warpToPathStart, which was essentially a no-op
because Entity::followingPath was always NULL. Removed related code.
- Set texture wrap only when required.
(Some changes taken from https://bitbucket.org/mattbierner/ios-aquaria,
special thanks for changeset 72d6460d9e60)
Also simplified .zga texture and .aqs savegame loading.
Dropped support for "crunched" .sav files (those were never used),
and the corresponding crunch functions.
To be done: Temp files are still used when compressing files,
will address this in a later commit.
