added scrollwheel support for GLFW

implemented scroll events based on the already provided scroll_cb in
ofAppGLFWWindow.cpp
fixed inconsistent indentation
deleted subproject in devApps
ofBitmapFont: fix x,y position for generated mesh
Merge branch 'master' into bugfix-ofGet/SetBackgroundColor
ofThread android: fix warning
Merge branch 'feature-scrollwheel-support' of https://github.com/fakob/openFrameworks into feature-scroll

Conflicts:
	libs/openFrameworks/app/ofAppRunner.cpp
	libs/openFrameworks/events/ofEvents.h
scroll event to float
fixes for ofDrawGridPlane, ofDrawGrid

+ fixes issue where central axis would not be drawn when non-integer tick count specified
+ fixes ofDrawGrid API to specify stepSize and numberOfSteps rather than scale, tickNumber
+ ensures numberOfSteps be a positive integer
changelog update
nmerge thread error logger
ofShader: fix logging messages
scroll: add scroll to ofxGui and ofEasyCam.
ofBaseApp: scroll double -> float
Fixes #3317. Make sure that pictureSize and previewSize have same aspect ratio
Changelog entry for change to OFAndroidVideoGrabber to fix image stretching problem on some devices
Merge pull request #3318 from brinkmwj/fugfix-ofandroidvideograbber-stretching-artifacts

Bug fix for camera stretching artifacts on some Android devices
getTextureReference -> getTexture
*getTexture -> *getTexturePtr
uniformized API:

loadMovie -> load
loadImage -> load
saveImage -> save
initGrabber -> setup

old methods are deprecated except in the base classes and implementations
where it's dropped completely
Merge pull request #3320 from arturoc/refactor-API

uniformize API: