Merge pull request #92 from mbg033/master

#Issue 66 (screen capturing)
заполенение качеств кодирования
Merge pull request #93 from mbg033/master

Issue #66 (fix)
заполнение комбиков в StartAir
new methods for zcore
fix rePosition bug
fix aspect ratio when resize
out images rect
check if the window system has any OpenGL support
fix hide/show box
fixed timer and stop/start
change menu
Merge pull request #95 from slima4/master

fix Issue #89
Merge pull request #96 from mbg033/master

#Issue 66 (non-modal selection rectangle) + syntax error fixed in layerwidget.cpp
sync
Merge remote-tracking branch 'upstream/master'
hide checkbox OpenGL
small fix
added OpenGL in LayerWidget
OpenGL test;