Update gitignore structure.

Refactor out gitignore in /other/serialTest.
Add some more noticable headers.
Some simplifaction and restructuring.
Clean up some files.
Refactor out lib platform gitignore files.
Refactor out some gitignore files from AdvancedImageLoading.
Remove erroneously committed XCode project components. Closes #2057.
gitignore: correct comment spacing, minor updates.
changing releaseAll to clear bugs
ensuring that element is null
- fixed bug where seeking would sometimes get stuck.
- improved seeking accuracy.
- fixed crashes when accessing samples at the end of a video.
- fixed texture caching issue when video was recorded.
- added methods for audio sampling.
- added methods for enabling/disabling video and audio sampling when not needed. by default sampling is on.
Merge branch 'master' into ios-videoplayer-fixes
ofBaseApp: remove mouseReleased(void) - the variant with x/y/button params is always called anyway, so this one was essentially unused and confusing.

fixes #2668
ofMath: remove ofAngleSumRadians. Closes #2747
Merge branch 'master' of github.com:openframeworks/openFrameworks
Merge pull request #2746 from liamstask/ofBaseApp-remove-mouseReleased-void

ofBaseApp: remove mouseReleased(void) - the variant with x/y/button para...
Fixed loadDialogBrowseCallback to return UNICODE string.
In ofSystemLoadDialog, passed windowTitle into dialog box.
Changes to ofGstVideo files to compile with 0.10 gstreamer and fixup file names in Win32.
Merge pull request #2751 from ngbrown/fixGStreamerForWin

Changes to ofGstVideo files to compile with 0.10 gstreamer and fixup file names in Win32
Merge pull request #1 from openframeworks/master

merge openFrameworks master
Fix typo
Clarified some error messages
Clarified some error messages