Support drag and drop of project files to the main window
add "text/plain" and "text/uri-list" support for the mimeData type of the drag and drop to prevent so problem on Mac and Windows platform.
Merge pull request #354 from est77/master

Fix gcc crashes in OSL
fix few minor issues
Merge pull request #353 from fewo/master

Support drag and drop of project files to the main window
Recompute slider range for out-of-range values
Added option to render from appleseed.cli to Houdini's mplay.
Updated code to follow coding guidelines
Fixed PR comments.
More PR fixes
Merge pull request #357 from vidarn/master

Recompute slider range for out-of-range values (issue #262)
Merge pull request #358 from est77/cli_mplay_tile_callbacks

Added option to render from appleseed.cli to Houdini's mplay.
fixed compilation on Windows; many minor coding style tweaks.
Schedule instantiation

When a rendering is active instantiation will not happen right away.
but it will be scheduled. Currently it is possible to instantiate
only an assembly and an object.

This commit fixes issue #327
Fixed mplay tile callback on OSX.
Fixed bug when entering values lower than the min for sliders
Merge pull request #362 from vidarn/master

Fixed bug when entering values lower than the minimum for sliders
Schedule instantiation: coding style fixes

A few thinkg overlooked in the previous commit.
Merge pull request #360 from marius-avram/B327

Schedule instantiation
Add UI button to reset zoom to 1:1:
- create button and icon
- maintain reset zoom independant for each tab
- attach shorcut to button (removed from widgetzoomhandler)