Updated xcconfigs to allow setting of SDKROOT successfully to 10.4 / 10.5 and 10.6 (10.7 untested).
Added more build folders to .gitignore
Fixed compiler errors when compiling with SDKROOT > 10.4
Merge branch 'bugfix-10838' into release-6.0.1
Update submodules.
Remove atl headers from w32 externals
Merge branch 'bugfix-10853' into release-6.0.1
fix intersect detection with semi-transparent images
Fix gif with no repeatcount (i.e. -1) not animating when loaded
Comment previous change
Fixed bug 10837 - literals that look like numbers must eval as 'both' (string and number).
Fixed bug 10844 - incorrect evaluation of threshold parameter, should use ton() rather than ston().
Reduce stack load times due to image loading
Merge branch 'bugfix-10828' into release-6.0.1
Merge branch 'bugfix-10843' into release-6.0.1
Merge branch 'bugfix-10827' into release-6.0.1
Merge branch 'bugfix-10837' into release-6.0.1
Merge branch 'bugfix-10844' into release-6.0.1
Update submodules.
Merge commit 'd6e38f24803032ae18cea20490be189230d2a69b' into feature/_internalResolveImage
made style and error handling changes as required